利用Scrollow写一个下拉刷新

利用scrollView滑动的2个监听方法实现

//滑动结束时候 出发的方法

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{

if (self.refreshLabel.tag == 1) {

[UIView animateWithDuration:.3 animations:^{

//            [self searchSevicePushData];

self.refreshLabel.text = @"加载中...";

scrollView.contentInset = UIEdgeInsetsMake(80.0f, 0.0f, 0.0f, 0.0f);

}];

//数据加载成功后执行；这里为了模拟加载效果，一秒后执行恢复原状代码

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{

[self loadSexButton];

[UIView animateWithDuration:.3 animations:^{

self.refreshLabel.tag = 0;

self.refreshLabel.text = @"下拉刷新";

scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);

}];

});

}

}

//滑动过程中的监听方法

#pragma mark -UIScrollViewDelegate

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

//    NSLog(@"滑动%f",scrollView.contentOffset.y);

if (scrollView.contentOffset.y <= -70)

{

//        CGFloat y = fabs(scrollView.contentOffset.y);

//        NSLog(@"%f",y);

if (self.refreshLabel.tag == 0) {

self.refreshLabel.text = @"松开刷新";

}

self.refreshLabel.tag = 1;

}else{

//防止用户在下拉到contentOffset.y <= -50后不松手，然后又往回滑动，需要将值设为默认状态

self.refreshLabel.tag = 0;

self.refreshLabel.text = @"下拉刷新";

}

}