保持 iPhone UIButton 突出显示

沃梦达教程移动开发问题

2022-01-01

Keep iPhone UIButton Highlighted(保持 iPhone UIButton 突出显示)

本文介绍了保持 iPhone UIButton 突出显示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下代码片段:

@interface Foo: UIViewController {
  ...
  UIButton *myButton;
  ...
}

@implementation Foo

- (void) viewDidLoad {
  ...
  myButton.highlighted = YES;
  ...
}

当我运行应用程序时，按钮以蓝色突出显示(默认行为).它按我的预期工作.

When I run the app, the button is highlighted in blue (default behavior). It works as I expected.

但是在按下按钮一次后，按钮不再突出显示.

But after pressing the button once, the button is no longer highlighted.

然后，我创建了一个 IBAction highlightButton 来处理 Touch Up Inside 事件，在该事件中我显式调用 myButton.highlighted = Yes;.不幸的是，按钮突出显示仍然没有保留.


Then, I created an IBAction highlightButton to handle Touch Up Inside event where I explicitly call myButton.highlighted = Yes;. Unfortunately, the button highlight still does not stay.
如何在按下后仍以蓝色突出显示?
How can I keep it highlighted in blue even after being pressed?
推荐答案
解决方法是在下一个runloop中做[button setHighlighted:YES]:
The solution is to do [button setHighlighted:YES] in the next runloop:
- (void)highlightButton:(UIButton *)b { 
    [b setHighlighted:YES];
}

 - (IBAction)onTouchup:(UIButton *)sender {
    [self performSelector:@selector(highlightButton:) withObject:sender afterDelay:0.0];
}


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