如何防止UIButton在更新标题时闪烁
如何防止UIButton在更新标题时闪烁
提问于 2013-10-15 08:42:05
当我在UIButton上调用setTitle时，按钮在iOS 7中闪烁。我尝试设置myButton.highlighted = NO，但这并没有阻止按钮闪烁。
[myButton setTitle:[[NSUserDefaults standardUserDefaults] stringForKey:@"elapsedLabelKey"] forState:UIControlStateNormal];
myButton.highlighted = NO;下面是我如何设置更新标题的计时器：
- (void)actionTimer {
if (myTimer == nil) {
myTimer = [NSTimer scheduledTimerWithTimeInterval: 1.0
target: self
selector: @selector(showActivity)
userInfo: nil
repeats: YES];
}
}下面是实际更新标题的方法：
- (void)showActivity {
NSString *sym = [[NSLocale currentLocale] objectForKey:NSLocaleCurrencySymbol];
if (pauseInterval == nil) {
// Update clock
seconds = [[NSDate date] timeIntervalSinceDate:startInterval] - breakTime;
// Update total earned
secRate = rate.value / 60 / 60;
total = secRate * seconds;
[totalLabel setTitle:[NSString stringWithFormat:@"%@%.4f",sym,total] forState:UIControlStateNormal];
days = seconds / (60 * 60 * 24);
seconds -= days * (60 * 60 * 24);
int hours = seconds / (60 * 60);
fhours = (float)seconds / (60.0 * 60.0);
seconds -= hours * (60 * 60);
int minutes = seconds / 60;
seconds -= minutes * 60;
// Update the timer clock
[elapsed setTitle:[NSString stringWithFormat:@"%.2i:%.2i:%.2i:%.2i",days,hours,minutes,seconds] forState:UIControlStateNormal];
}
}回答 6
Stack Overflow用户
发布于 2016-08-22 12:57:21
与可能影响其他动画的[UIView setAnimationsEnabled:NO]相比，一种更好的方法是仅禁用特定的标题动画。
Objective-C：
[UIView performWithoutAnimation:^{
[myButton setTitle:text forState:UIControlStateNormal];
[myButton layoutIfNeeded];
}];Swift：
UIView.performWithoutAnimation {
myButton.setTitle(text, for: .normal)
myButton.layoutIfNeeded()
}Stack Overflow用户
发布于 2013-11-01 12:54:47
查看来自How to stop unwanted UIButton animation on title change?的响应：
[UIView setAnimationsEnabled:NO];
[elapsed setTitle:[NSString stringWithFormat:@"%.2i:%.2i:%.2i:%.2i",days,hours,minutes,seconds] forState:UIControlStateNormal];
[UIView setAnimationsEnabled:YES];Stack Overflow用户
发布于 2017-06-20 07:36:30
您可以简单地为UIButton创建另一个函数，以便将来使用。
extension UIButton {
func setTitleWithoutAnimation(_ title: String?, for controlState: UIControlState) {
UIView.performWithoutAnimation {
self.setTitle(title, for: controlState)
self.layoutIfNeeded()
}
}
}就是这样！
只需像以前一样设置标题，但请用setTitleWithoutAnimation替换setTitle
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/19371522
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