327 lines
8.8 KiB
Objective-C
327 lines
8.8 KiB
Objective-C
//
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// NTESPageView.m
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// NIM
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//
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// Created by chris on 15/12/16.
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// Copyright © 2015年 Netease. All rights reserved.
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//
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#import "NTESPageView.h"
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@interface NTESPageScrollView : UIScrollView
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@end
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@interface NTESPageView ()
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{
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NSInteger _currentPage;
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NSInteger _currentPageForRotation;
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}
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@property (nonatomic,strong) NSMutableArray *pages;
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- (void)setupControls;
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//重新载入的流程
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- (void)calculatePageNumbers;
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- (void)reloadPage;
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- (void)raisePageIndexChangedDelegate;
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@end
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@implementation NTESPageView
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- (id)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self)
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{
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[self setupControls];
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}
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return self;
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}
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- (id)initWithCoder:(NSCoder *)aDecoder
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{
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if (self = [super initWithCoder:aDecoder])
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{
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[self setupControls];
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}
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return self;
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}
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- (void)setFrame:(CGRect)frame{
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CGFloat originalWidth = self.frame.size.width;
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[super setFrame:frame];
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if (originalWidth != frame.size.width) {
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[self reloadData];
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}
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}
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- (void)dealloc
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{
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_scrollView.delegate = nil;
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}
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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[_scrollView setFrame:self.bounds];
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CGSize size = self.bounds.size;
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[self.scrollView setContentSize:CGSizeMake(size.width * [self.pages count], size.height)];
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for (NSInteger i = 0; i < [self.pages count]; i++)
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{
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id obj = [self.pages objectAtIndex:i];
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if ([obj isKindOfClass:[UIView class]])
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{
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[(UIView *)obj setFrame:CGRectMake(size.width * i, 0, size.width, size.height)];
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}
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}
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//CGSize size = self.bounds.size;
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BOOL animation = NO;
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if (self.pageViewDelegate && [self.pageViewDelegate respondsToSelector:@selector(needScrollAnimation)])
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{
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animation = [self.pageViewDelegate needScrollAnimation];
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}
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[self.scrollView scrollRectToVisible:CGRectMake(_currentPage * size.width, 0, size.width, size.height)
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animated:animation];
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}
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- (void)setupControls
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{
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if (_scrollView == nil)
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{
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_scrollView = [[NTESPageScrollView alloc]initWithFrame:self.bounds];
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_scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
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[self addSubview:_scrollView];
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_scrollView.pagingEnabled = YES;
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_scrollView.showsVerticalScrollIndicator = NO;
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_scrollView.showsHorizontalScrollIndicator = NO;
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_scrollView.delegate = self;
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_scrollView.scrollsToTop = NO;
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}
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}
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#pragma mark - 对外接口
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- (void)scrollToPage: (NSInteger)page
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{
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if (_currentPage != page || page == 0)
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{
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_currentPage = page;
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[self reloadData];
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}
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}
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- (void)reloadData
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{
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[self calculatePageNumbers];
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[self reloadPage];
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}
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- (UIView *)viewAtIndex: (NSInteger)index
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{
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UIView *view = nil;
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if (index >= 0 && index < [_pages count])
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{
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id obj = [_pages objectAtIndex:index];
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if ([obj isKindOfClass:[UIView class]])
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{
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view = obj;
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}
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}
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return view;
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}
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- (NSInteger)currentPage
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{
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return _currentPage;
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}
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- (NSInteger)pageInBound:(NSInteger)value min:(NSInteger)min max:(NSInteger)max{
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if (max < min) {
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max = min;
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}
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NSInteger bounded = value;
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if (bounded > max) {
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bounded = max;
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}
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if (bounded < min) {
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bounded = min;
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}
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return bounded;
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}
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#pragma mark - Page载入和销毁
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- (void)loadPagesForCurrentPage:(NSInteger)currentPage
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{
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NSUInteger count = [_pages count];
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if (count == 0)
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{
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return;
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}
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NSInteger first = [self pageInBound:currentPage - 1 min:0 max:count - 1];
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NSInteger last = [self pageInBound:currentPage + 1 min:0 max:count - 1];
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NSRange range = NSMakeRange(first, last - first + 1);
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for (NSUInteger index = 0; index < count; index++)
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{
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if (NSLocationInRange(index, range))
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{
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id obj = [_pages objectAtIndex:index];
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if (![obj isKindOfClass:[UIView class]])
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{
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if (_dataSource && [_dataSource respondsToSelector:@selector(pageView:viewInPage:)])
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{
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UIView *view = [_dataSource pageView:self viewInPage:index];
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[_pages replaceObjectAtIndex:index withObject:view];
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[self.scrollView addSubview:view];
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CGSize size = self.bounds.size;
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[view setFrame:CGRectMake(size.width * index, 0, size.width, size.height)];
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}
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else
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{
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assert(0);
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}
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}
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}
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else
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{
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id obj = [_pages objectAtIndex:index];
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if ([obj isKindOfClass:[UIView class]])
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{
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[obj removeFromSuperview];
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[_pages replaceObjectAtIndex:index withObject:[NSNull null]];
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}
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}
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}
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}
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- (void)calculatePageNumbers
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{
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NSInteger numberOfPages = 0;
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for (id obj in _pages)
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{
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if ([obj isKindOfClass:[UIView class]])
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{
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[(UIView *)obj removeFromSuperview];
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}
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}
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if(_dataSource && [_dataSource respondsToSelector:@selector(numberOfPages:)])
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{
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numberOfPages = [_dataSource numberOfPages:self];
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}
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self.pages = [NSMutableArray arrayWithCapacity:numberOfPages];
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for (NSInteger i = 0; i < numberOfPages; i ++)
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{
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[_pages addObject:[NSNull null]];
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}
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//注意，这里设置delegate是因为计算contentsize的时候会引起scrollViewDidScroll执行，修改currentpage的值，这样在贴图（举个例子）前面的分类页数比后面的分类页数多，前面的分类滚动到最后面一页后，再显示后面的分类，会显示不正确
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self.scrollView.delegate = nil;
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CGSize size = self.bounds.size;
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[self.scrollView setContentSize:CGSizeMake(size.width * numberOfPages, size.height)];
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self.scrollView.delegate = self;
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}
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- (void)reloadPage
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{
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//reload的时候尽量记住上次的位置
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if (_currentPage >= [_pages count])
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{
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_currentPage = [_pages count] - 1;
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}
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if (_currentPage < 0)
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{
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_currentPage = 0;
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}
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[self loadPagesForCurrentPage:_currentPage];
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[self raisePageIndexChangedDelegate];
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[self setNeedsLayout];
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}
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#pragma mark - ScrollView Delegate
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView
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{
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CGFloat width = scrollView.bounds.size.width;
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CGFloat offsetX = scrollView.contentOffset.x;
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NSInteger page = (NSInteger)(fabs(offsetX / width));
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if (page >= 0 && page < [_pages count])
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{
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if (_currentPage == page) {
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return;
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}
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_currentPage = page;
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[self loadPagesForCurrentPage:_currentPage];
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}
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if (_pageViewDelegate && [_pageViewDelegate respondsToSelector:@selector(pageViewDidScroll:)])
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{
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[_pageViewDelegate pageViewDidScroll:self];
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}
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}
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- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
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{
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[self raisePageIndexChangedDelegate];
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}
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#pragma mark - 辅助方法
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- (void)raisePageIndexChangedDelegate
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{
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if (_pageViewDelegate && [_pageViewDelegate respondsToSelector:@selector(pageViewScrollEnd:currentIndex:totolPages:)])
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{
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[_pageViewDelegate pageViewScrollEnd:self
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currentIndex:_currentPage
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totolPages:[_pages count]];
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}
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}
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- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
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duration:(NSTimeInterval)duration
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{
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_scrollView.delegate = nil;
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_currentPageForRotation = _currentPage;
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}
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- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
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duration:(NSTimeInterval)duration
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{
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CGSize size = self.bounds.size;
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_scrollView.contentSize = CGSizeMake(size.width * [_pages count], size.height);
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for (NSUInteger i = 0; i < [_pages count]; i++)
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{
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id obj = [_pages objectAtIndex:i];
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if ([obj isKindOfClass:[UIView class]])
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{
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[(UIView *)obj setFrame:CGRectMake(size.width * i, 0, size.width, size.height)];
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/*
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//这里有点ugly,先这样吧...
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if ([obj respondsToSelector:@selector(reset)])
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{
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[obj performSelector:@selector(reset)];
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}*/
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}
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}
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_scrollView.contentOffset = CGPointMake(_currentPageForRotation * self.bounds.size.width, 0);
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_scrollView.delegate = self;
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}
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@end
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@implementation NTESPageScrollView
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//fix: swipe to delete in a UITableView which is embeded in a UIScrollView
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- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(nonnull UIGestureRecognizer *)otherGestureRecognizer
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{
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return [otherGestureRecognizer.view.superview isKindOfClass:[UITableView class]];
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}
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@end |