保持iPhone UIButton突出显示

问题描述

我有以下代码片段：

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

@implementation Foo

@implementation Foo

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

当我运行应用程序时，按钮是以蓝色突出显示（默认行为）。它按预期工作。

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

但按下按钮一次后，该按钮不再突出显示。

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，我明确地调用 myButton.highlighted = Yes; 。不幸的是，按钮突出显示仍然没有停留。

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.

如果按下后如何将其突出显示为蓝色？

How can I keep it highlighted in blue even after being pressed?

推荐答案

解决办法是在下一个runloop中执行 [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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