273 lines
7.8 KiB
Objective-C
273 lines
7.8 KiB
Objective-C
// 代码地址: https://github.com/CoderMJLee/MJRefresh
|
|
// 代码地址: http://code4app.com/ios/%E5%BF%AB%E9%80%9F%E9%9B%86%E6%88%90%E4%B8%8B%E6%8B%89%E4%B8%8A%E6%8B%89%E5%88%B7%E6%96%B0/52326ce26803fabc46000000
|
|
// MJRefreshComponent.m
|
|
// MJRefreshExample
|
|
//
|
|
// Created by MJ Lee on 15/3/4.
|
|
// Copyright (c) 2015年 小码哥. All rights reserved.
|
|
//
|
|
|
|
#import "MJRefreshComponent.h"
|
|
#import "MJRefreshConst.h"
|
|
|
|
@interface MJRefreshComponent()
|
|
@property (strong, nonatomic) UIPanGestureRecognizer *pan;
|
|
@end
|
|
|
|
@implementation MJRefreshComponent
|
|
#pragma mark - 初始化
|
|
- (instancetype)initWithFrame:(CGRect)frame
|
|
{
|
|
if (self = [super initWithFrame:frame]) {
|
|
// 准备工作
|
|
[self prepare];
|
|
|
|
// 默认是普通状态
|
|
self.state = MJRefreshStateIdle;
|
|
}
|
|
return self;
|
|
}
|
|
|
|
- (void)prepare
|
|
{
|
|
// 基本属性
|
|
self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
|
|
self.backgroundColor = [UIColor clearColor];
|
|
}
|
|
|
|
- (void)layoutSubviews
|
|
{
|
|
[self placeSubviews];
|
|
|
|
[super layoutSubviews];
|
|
}
|
|
|
|
- (void)placeSubviews{}
|
|
|
|
- (void)willMoveToSuperview:(UIView *)newSuperview
|
|
{
|
|
[super willMoveToSuperview:newSuperview];
|
|
|
|
// 如果不是UIScrollView，不做任何事情
|
|
if (newSuperview && ![newSuperview isKindOfClass:[UIScrollView class]]) return;
|
|
|
|
// 旧的父控件移除监听
|
|
[self removeObservers];
|
|
|
|
if (newSuperview) { // 新的父控件
|
|
// 设置宽度
|
|
self.mj_w = newSuperview.mj_w;
|
|
// 设置位置
|
|
self.mj_x = -_scrollView.mj_insetL;
|
|
|
|
// 记录UIScrollView
|
|
_scrollView = (UIScrollView *)newSuperview;
|
|
// 设置永远支持垂直弹簧效果
|
|
_scrollView.alwaysBounceVertical = YES;
|
|
// 记录UIScrollView最开始的contentInset
|
|
_scrollViewOriginalInset = _scrollView.mj_inset;
|
|
|
|
// 添加监听
|
|
[self addObservers];
|
|
}
|
|
}
|
|
|
|
- (void)drawRect:(CGRect)rect
|
|
{
|
|
[super drawRect:rect];
|
|
|
|
if (self.state == MJRefreshStateWillRefresh) {
|
|
// 预防view还没显示出来就调用了beginRefreshing
|
|
self.state = MJRefreshStateRefreshing;
|
|
}
|
|
}
|
|
|
|
#pragma mark - KVO监听
|
|
- (void)addObservers
|
|
{
|
|
NSKeyValueObservingOptions options = NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld;
|
|
[self.scrollView addObserver:self forKeyPath:MJRefreshKeyPathContentOffset options:options context:nil];
|
|
[self.scrollView addObserver:self forKeyPath:MJRefreshKeyPathContentSize options:options context:nil];
|
|
self.pan = self.scrollView.panGestureRecognizer;
|
|
[self.pan addObserver:self forKeyPath:MJRefreshKeyPathPanState options:options context:nil];
|
|
}
|
|
|
|
- (void)removeObservers
|
|
{
|
|
[self.superview removeObserver:self forKeyPath:MJRefreshKeyPathContentOffset];
|
|
[self.superview removeObserver:self forKeyPath:MJRefreshKeyPathContentSize];
|
|
[self.pan removeObserver:self forKeyPath:MJRefreshKeyPathPanState];
|
|
self.pan = nil;
|
|
}
|
|
|
|
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
|
|
{
|
|
// 遇到这些情况就直接返回
|
|
if (!self.userInteractionEnabled) return;
|
|
|
|
// 这个就算看不见也需要处理
|
|
if ([keyPath isEqualToString:MJRefreshKeyPathContentSize]) {
|
|
[self scrollViewContentSizeDidChange:change];
|
|
}
|
|
|
|
// 看不见
|
|
if (self.hidden) return;
|
|
if ([keyPath isEqualToString:MJRefreshKeyPathContentOffset]) {
|
|
[self scrollViewContentOffsetDidChange:change];
|
|
} else if ([keyPath isEqualToString:MJRefreshKeyPathPanState]) {
|
|
[self scrollViewPanStateDidChange:change];
|
|
}
|
|
}
|
|
|
|
- (void)scrollViewContentOffsetDidChange:(NSDictionary *)change{}
|
|
- (void)scrollViewContentSizeDidChange:(NSDictionary *)change{}
|
|
- (void)scrollViewPanStateDidChange:(NSDictionary *)change{}
|
|
|
|
#pragma mark - 公共方法
|
|
#pragma mark 设置回调对象和回调方法
|
|
- (void)setRefreshingTarget:(id)target refreshingAction:(SEL)action
|
|
{
|
|
self.refreshingTarget = target;
|
|
self.refreshingAction = action;
|
|
}
|
|
|
|
- (void)setState:(MJRefreshState)state
|
|
{
|
|
_state = state;
|
|
|
|
// 加入主队列的目的是等setState:方法调用完毕、设置完文字后再去布局子控件
|
|
MJRefreshDispatchAsyncOnMainQueue([self setNeedsLayout];)
|
|
}
|
|
|
|
#pragma mark 进入刷新状态
|
|
- (void)beginRefreshing
|
|
{
|
|
[UIView animateWithDuration:MJRefreshFastAnimationDuration animations:^{
|
|
self.alpha = 1.0;
|
|
}];
|
|
self.pullingPercent = 1.0;
|
|
// 只要正在刷新，就完全显示
|
|
if (self.window) {
|
|
self.state = MJRefreshStateRefreshing;
|
|
} else {
|
|
// 预防正在刷新中时，调用本方法使得header inset回置失败
|
|
if (self.state != MJRefreshStateRefreshing) {
|
|
self.state = MJRefreshStateWillRefresh;
|
|
// 刷新(预防从另一个控制器回到这个控制器的情况，回来要重新刷新一下)
|
|
[self setNeedsDisplay];
|
|
}
|
|
}
|
|
}
|
|
|
|
- (void)beginRefreshingWithCompletionBlock:(void (^)(void))completionBlock
|
|
{
|
|
self.beginRefreshingCompletionBlock = completionBlock;
|
|
|
|
[self beginRefreshing];
|
|
}
|
|
|
|
#pragma mark 结束刷新状态
|
|
- (void)endRefreshing
|
|
{
|
|
MJRefreshDispatchAsyncOnMainQueue(self.state = MJRefreshStateIdle;)
|
|
}
|
|
|
|
- (void)endRefreshingWithCompletionBlock:(void (^)(void))completionBlock
|
|
{
|
|
self.endRefreshingCompletionBlock = completionBlock;
|
|
|
|
[self endRefreshing];
|
|
}
|
|
|
|
#pragma mark 是否正在刷新
|
|
- (BOOL)isRefreshing
|
|
{
|
|
return self.state == MJRefreshStateRefreshing || self.state == MJRefreshStateWillRefresh;
|
|
}
|
|
|
|
#pragma mark 自动切换透明度
|
|
- (void)setAutoChangeAlpha:(BOOL)autoChangeAlpha
|
|
{
|
|
self.automaticallyChangeAlpha = autoChangeAlpha;
|
|
}
|
|
|
|
- (BOOL)isAutoChangeAlpha
|
|
{
|
|
return self.isAutomaticallyChangeAlpha;
|
|
}
|
|
|
|
- (void)setAutomaticallyChangeAlpha:(BOOL)automaticallyChangeAlpha
|
|
{
|
|
_automaticallyChangeAlpha = automaticallyChangeAlpha;
|
|
|
|
if (self.isRefreshing) return;
|
|
|
|
if (automaticallyChangeAlpha) {
|
|
self.alpha = self.pullingPercent;
|
|
} else {
|
|
self.alpha = 1.0;
|
|
}
|
|
}
|
|
|
|
#pragma mark 根据拖拽进度设置透明度
|
|
- (void)setPullingPercent:(CGFloat)pullingPercent
|
|
{
|
|
_pullingPercent = pullingPercent;
|
|
|
|
if (self.isRefreshing) return;
|
|
|
|
if (self.isAutomaticallyChangeAlpha) {
|
|
self.alpha = pullingPercent;
|
|
}
|
|
}
|
|
|
|
#pragma mark - 内部方法
|
|
- (void)executeRefreshingCallback
|
|
{
|
|
MJRefreshDispatchAsyncOnMainQueue({
|
|
if (self.refreshingBlock) {
|
|
self.refreshingBlock();
|
|
}
|
|
if ([self.refreshingTarget respondsToSelector:self.refreshingAction]) {
|
|
MJRefreshMsgSend(MJRefreshMsgTarget(self.refreshingTarget), self.refreshingAction, self);
|
|
}
|
|
if (self.beginRefreshingCompletionBlock) {
|
|
self.beginRefreshingCompletionBlock();
|
|
}
|
|
})
|
|
}
|
|
@end
|
|
|
|
@implementation UILabel(MJRefresh)
|
|
+ (instancetype)mj_label
|
|
{
|
|
UILabel *label = [[self alloc] init];
|
|
label.font = MJRefreshLabelFont;
|
|
label.textColor = MJRefreshLabelTextColor;
|
|
label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
|
|
label.textAlignment = NSTextAlignmentCenter;
|
|
label.backgroundColor = [UIColor clearColor];
|
|
return label;
|
|
}
|
|
|
|
- (CGFloat)mj_textWith {
|
|
CGFloat stringWidth = 0;
|
|
CGSize size = CGSizeMake(MAXFLOAT, MAXFLOAT);
|
|
if (self.text.length > 0) {
|
|
#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000
|
|
stringWidth =[self.text
|
|
boundingRectWithSize:size
|
|
options:NSStringDrawingUsesLineFragmentOrigin
|
|
attributes:@{NSFontAttributeName:self.font}
|
|
context:nil].size.width;
|
|
#else
|
|
|
|
stringWidth = [self.text sizeWithFont:self.font
|
|
constrainedToSize:size
|
|
lineBreakMode:NSLineBreakByCharWrapping].width;
|
|
#endif
|
|
}
|
|
return stringWidth;
|
|
}
|
|
@end
|