重复弹出一个View的问题

[dhui68]

在TYAlertScaleFadeAnimation.m文件中，
[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
alertController.backgroundView.alpha = 0.0;
switch (alertController.preferredStyle) {
case TYAlertControllerStyleAlert:
alertController.alertView.alpha = 0.0;
alertController.alertView.transform = CGAffineTransformMakeScale(0.1, 0.1);
break;
case TYAlertControllerStyleActionSheet:
alertController.alertView.transform = CGAffineTransformMakeTranslation(0, CGRectGetHeight(alertController.alertView.frame));
break;
default:
break;
}
} completion:^(BOOL finished) {
[transitionContext completeTransition:YES];
}];
我发现当alertController dismissAnimateTransition的时候，alertView动画执行了缩小0.1 但动画完成了没有执行 alertController.alertView.transform = CGAffineTransformIdentity;这样重复弹出一个View就不是原始的frame，还有发现[_alertView addConstraintWidth:CGRectGetWidth(_alertView.frame) height:CGRectGetHeight(_alertView.frame)]; 重复的添加宽度和高度约束