ios - 如何创建帮助覆盖图，iOS

Question

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Answer 1

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objective-C

// get window screen size for frame
CGRect screensize = [[UIScreen mainScreen] bounds];
//create a new UIview with the same size for same view
UIView* TransprentView = [[UIView alloc] initWithFrame:screensize];

// change the background color to black and the opacity to 0.6 for Transparent
TransprentView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];

  // here add your Label, Image, etc, what ever you want

// add this TransprentView to your main view
[self.view addSubview:TransprentView];

你可以从 super View 中删除它:

[TransprentView removeFromSuperview];

Swift 2 及更高版本

 let TransprentView =  UIView(frame: UIScreen.mainScreen().bounds)

    TransprentView.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(0.5)

    // here add your Label, Image, etc, what ever you want

    self.view.addSubview(TransprentView)

你可以从 super View 中删除它:

    TransprentView.removeFromSuperview()