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