关于IOS-移除imageView 的问题
屏幕上有一张图片需要在停留的时候全屏。
UILongPressGestureRecognizer *hold = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(hold:)];
hold.minimumPressDuration = 0;
[self.photoImageView addGestureRecognizer:hold];监听器：
-(void)hold:(UILongPressGestureRecognizer *)sender{
UIImageView *img = [[UIImageView alloc] initWithImage:self.photo];
img.userInteractionEnabled = NO;
if(sender.state == UIGestureRecognizerStateBegan){
NSLog(@"state began");
[self.view addSubview:img];
} else if (sender.state == UIGestureRecognizerStateEnded){
NSLog(@"state ended");
[img removeFromSuperview];
}
}图片成功添加到屏幕中，只有 [img removeFromSuperview]好像没有响应。
结束状态的NSlog也正常。
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-(void)hold:(UILongPressGestureRecognizer *)sender{ //每次响应函数 img都是一个新alloc出来的UIImageView UIImageView *img = [[UIImageView alloc] initWithImage:self.photo]; img.userInteractionEnabled = NO; if(sender.state == UIGestureRecognizerStateBegan){ NSLog(@"state began"); //添加新alloc出来的UIImageView，可以看到界面效果 [self.view addSubview:img]; } else if (sender.state == UIGestureRecognizerStateEnded){ NSLog(@"state ended"); //remove 新alloc出来的UIImageView当然没有效果，它还没有被add进去 [img removeFromSuperview]; } }改成这样
-(void)hold:(UILongPressGestureRecognizer *)sender{ if(sender.state == UIGestureRecognizerStateBegan){ NSLog(@"state began"); UIImageView *img = [[UIImageView alloc] initWithImage:self.photo]; img.userInteractionEnabled = NO; img.tag = kTAG_PHOTO_IMAGE_VIEW [self.view addSubview:img]; } else if (sender.state == UIGestureRecognizerStateEnded){ NSLog(@"state ended"); UIImageView *img = (UIImageView *)[self.view viewWithTag:kTAG_PHOTO_IMAGE_VIEW]; [img removeFromSuperview]; } }2019-07-17 19:10:11赞同 展开评论 打赏
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