UIView中屏幕点击删除遮罩

最新推荐文章于 2024-04-07 14:25:55 发布

原创最新推荐文章于 2024-04-07 14:25:55 发布 · 441 阅读

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本文介绍在iOS中如何使用UIView的layoutSubviews方法和Core Graphics进行遮罩视图的弹出与消失动画效果实现，包括动画延迟执行的两种方法。

1.遮罩制作

重载layoutSubviews函数，要了解这个函数就看看UIView生命周期
_bottomHeight ：下面弹出框的高度
CGAffineTransformMakeTranslation 定义运动方向负_bottomHeight表示0.3秒内移动这个距离

弹出结束后，即completion 后执行后面的内容

//在这个类里重载
@interface myActionSheet : UIView
@end

- (void)layoutSubviews {
    [super layoutSubviews];
        if (_bottomHeight > 0) {
            [UIView animateWithDuration:0.3 animations:^{
                self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];
                self.bottomView.transform = CGAffineTransformMakeTranslation(0, -_bottomHeight);
            } completion:^(BOOL finished) {
                //自己想显示的内容
            }];
            _bottomHeight = 0;
        }
}

2.当遮罩住屏幕后，点一下立马消失

#pragma mark - Override Method 
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self dismiss];
}

- (void)dismiss {
    [UIView animateWithDuration:0.3 animations:^{
        self.backgroundColor = [UIColor clearColor];
        self.bottomView.transform = CGAffineTransformMakeTranslation(0,CGRectGetHeight(self.bottomView.frame));
    } completion:^(BOOL finished) {
        [self removeFromSuperview];
    }];
    
}

另外一种制造延迟的方法

self.collectionView.transform = CGAffineTransformMakeTranslation(0.01, self.HeightFrame);
    [myGCDQueue executeInMainQueue:^{
        [UIView animateWithDuration:0.3 animations:^{
            self.collectionView.transform = CGAffineTransformMakeTranslation(0, 0);
            self.view.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];
        }completion:^(BOOL finished) {
            
        }];
    }afterDelaySecs:0.1];

@interface myGCDQueue : NSObject

//主线程延时执行gcd
+ (void)executeInMainQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec;

@end

@implementation myGCDQueue
+ (void)executeInMainQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec {
    
    NSParameterAssert(block);
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * sec),dispatch_get_main_queue(), block);
}
@end