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?
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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