单击按钮时，如何将 UIView 添加为 UIViewController 的子视图? [英] How can I add a UIView as a subview of UIViewController when a button clicked?

问题描述

在我的应用程序中，每当用户点击我的主 UIViewController 中的按钮时，我都需要动态添加 UIView.我该怎么做?

In my app I need to add a UIView dynamically whenever user taps on a button in my main UIViewController. How can I do this?

推荐答案

在您的视图控制器中使用此签名创建一个新方法:-(IBAction) buttonTapped:(id)sender.保存您的文件.转到 Interface Builder 并将您的按钮连接到此方法(按住 Control 单击并从您的按钮拖动到视图控制器 [可能是您的文件的所有者] 并选择 -buttonTapped 方法).然后实现方法:

Create a new method in your view controller with this signature: -(IBAction) buttonTapped:(id)sender. Save your file. Go to Interface Builder and connect your button to this method (control-click and drag from your button to the view controller [probably your File's owner] and select the -buttonTapped method). Then implement the method:

-(IBAction) buttonTapped:(id)sender {
    // create a new UIView
    UIView *newView = [[UIView alloc] initWithFrame:CGRectMake(10,10,100,100)];

    // do something, e.g. set the background color to red
    newView.backgroundColor = [UIColor redColor];

    // add the new view as a subview to an existing one (e.g. self.view)
    [self.view addSubview:newView];

    // release the newView as -addSubview: will retain it
    [newView release];
}

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