xcode 从其 Superview 中删除 UIImageView
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remove UIImageView from its Superview
提问by CristiC
In my application when the user touches the screen, I put an UIImageViewon the screen like this:
在我的应用程序中，当用户触摸屏幕时，我会UIImageView像这样在屏幕上放置一个：
- (void) drawPoint:(CGPoint) toLocation {
UIImageView *image = [[UIImageView alloc] initWithFrame:CGRectMake(toLocation.x, toLocation.y, SIZE_X, SIZE_Y)];
image.tag = 1;
[image setImage:[UIImage imageNamed:@"point.png"]];
[self.myView addSubview:image];
[image release];
}
Here MyViewis an UIView.
这MyView是一个UIView.
When the user has finished touching, I want to remove my UIImageView. I have tried this:
当用户完成触摸时，我想删除我的UIImageView. 我试过这个：
- (void) removeFromPoint:(CGPoint) location{
UIImageView *image;
[[image viewWithTag:1] removeFromSuperview];
}
or
或者
- (void) removeFromPoint:(CGPoint) location{
UIImageView *image = (UIImageView *)[self.MyView viewWithTag:1];
[image removeFromSuperview];
}
but both of them end up in EXC_BAD_ACCESS. Do you know how can I accomplish this?
但它们都以 EXC_BAD_ACCESS 结束。你知道我怎样才能做到这一点吗？
Thanks.
谢谢。
采纳答案by Piotr Czapla
If you want to remove uimage under the touch try this:
如果你想在触摸下删除 uimage 试试这个：
UIView * imageView = [self.myView hitTest:location withEvent:nil];
if ([imageView isKindOfClass:[UIImageView class]] && imageView.tag == 1) {
[imageView removeFromSuperview];
}
(note I've typed it here, i haven't test that code)
（注意我在这里输入了它，我还没有测试那个代码）
If you wish to debug your code enable NSZombies and check why you gets the bad_access. (check this to learn more about NSZombieEnabled http://www.cocoadev.com/index.pl?NSZombieEnabled)
如果你想调试你的代码，启用 NSZombies 并检查为什么你会得到 bad_access。（检查这个以了解更多关于 NSZombieEnabled http://www.cocoadev.com/index.pl?NSZombieEnabled）
If you are going to add only one view. Then I would store it in a retained property and I would add/remove it on events like this:
如果您只想添加一个视图。然后我将它存储在一个保留的属性中，我会在这样的事件中添加/删除它：
@property (nonatomic,retain) UIImageView* marker;
@interface
@syntesize marker;
-(void) onTouchDown {
[self.view addSubview:marker];
}
-(void) onTouchUp {
[marker removeFromSuperview];
}
回答by Alexander Belyavskiy
The first example of removing image view is wrong.
In the second one what is POINT_TAG equal to?
Try to use tag greater then 9.
Try to debug what UIImageView *image = (UIImageView *)[self.MyView viewWithTag:POINT_TAG];returns.
第一个删除图像视图的例子是错误的。在第二个中 POINT_TAG 等于什么？尝试使用大于 9 的标记。尝试调试UIImageView *image = (UIImageView *)[self.MyView viewWithTag:POINT_TAG];返回的内容。
