以编程方式通过 uibutton 删除 uiview

Posted 2023-02-27

【中文标题】以编程方式通过 uibutton 删除 uiview

【英文标题】：remove uiview by uibutton programmatically

【发布时间】：2012-01-03 18:26:04

【问题描述】：

我不知道如何通过用户单击 uibutton 来删除 uiview，一旦加载场景，uibutton 就会加载。 uibutton 也没有得到响应。 我应该如何设置它？请帮忙，非常感谢。

- (void)viewWillAppear:(BOOL)animated 
    UIView *holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 50, _imagePicker.selectedImage.size.width, _imagePicker.selectedImage.size.height)];
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:[holderView frame]];
    [imageView setImage:_imagePicker.selectedImage];
    [holderView addSubview:imageView];

    UIButton *removeSticker = [UIButton buttonWithType:UIButtonTypeCustom];
    removeSticker.frame = CGRectMake(0, 0, 200, 100);
    [removeSticker setImage:[UIImage imageNamed:@"cancel-disabled.png"] forState:UIControlStateNormal];
    [removeSticker addTarget:holderView action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [holderView addSubview: removeSticker];

    UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)];
    [pinchRecognizer setDelegate:self];
    [holderView addGestureRecognizer:pinchRecognizer];

    UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
    [rotationRecognizer setDelegate:self];
    [holderView addGestureRecognizer:rotationRecognizer];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [panRecognizer setDelegate:self];
    [holderView addGestureRecognizer:panRecognizer];

    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
    [tapRecognizer setNumberOfTapsRequired:1];
    [tapRecognizer setDelegate:self];
    [holderView addGestureRecognizer:tapRecognizer];

    [parentPreviewView addSubview:holderView];


- (void) buttonClicked: (id)sender

    [self.view removeFromSuperview];

【参考方案1】：

将目标从holderView更改为self：

[removeSticker addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];

并将删除视图的代码更改为以下内容：

[holderView removeFromSuperview];

【讨论】：

好答案，假设最初的问题是关于删除holderView。我的一个建议是将buttonClicked 方法高于 viewWillAppear: 方法，特别是如果buttonClicked 未在.h 接口文件中声明。

@MichaelDautermann 我认为buttonClicked 方法定义在viewWillAppear 之上或之下并不重要，只要我们使用选择器即可。

感谢您的及时回复，但是当我将其更改为[holderView removeFromSuperview]; 时，它说使用未声明的标识符？

是的，那是因为holderView 是一个局部变量。您可以将其设为私有变量，或者只使用以下代码：UIView *holderView = [(UIButton *)sender superView]; [holderView removeFromSuperview];

可能是我说的不够清楚，我在做一个照片装饰app，其实我是想把用户添加的装饰贴纸去掉，也就是imageView，所以我应该删除 imageView 而不是 holderView？非常感谢。

【参考方案2】：

使用以下技术。指定您在视图中拥有的每个控件的标签。然后您可以从这个“标签”属性中受益

假设我将标签指定为 100。那么

 UIButtom *buttonToRemove=(UIButton*)[self.view   viewWithTag:100];

现在删除它（按钮）使用这个

[buttonToRemove removeFromSuperview];