UIView animateWithDuration:延迟:工作很奇怪

Question

我遇到了iPhone动画块的奇怪问题.这段代码:

[UIView animateWithDuration:2 delay: 0 options: 0 animations:
^(void) { [controller setBackgroundColor: [UIColor blueColor]]; }
completion: nil];

[UIView animateWithDuration:2 delay: 2 options: 0 animations:
^(void) { [controller setBackgroundColor: [UIColor redColor]]; }
completion: nil];

立即将背景设置为红色,而不通过蓝色状态.对于这段代码,即使是同样的事情:

[UIView animateWithDuration:2 delay: 0 options: 0 animations:
^(void) { [controller setBackgroundColor: [UIColor blueColor]]; }
completion: 

^(BOOL wrwg) {
    [UIView animateWithDuration:2 delay: 2 options: 0 animations:
    ^(void) { [controller setBackgroundColor: [UIColor redColor]]; }
    completion: nil];
}];

也就是说,我试图在第一个动画完成之后运行第二个动画.有什么问题？

Answer 1

我有同样的问题.使shure控制器的类型为UIView,否则动画块被解释为"无动画执行",因此被跳过并呈现下一个动画.

也看看这篇文章,我问同样的问题(由我解决):http: //www.iphonedevsdk.com/forum/iphone-sdk-development/64451-animation-one-after-another.html#post265531

Answer 2

物业backgroundColor是不是在UIView的动画.相反,使用backgroundColor视图图层的属性:

#import <QuartzCore/QuartzCore.h> // don't forget to link this library in project settings

[UIView animateWithDuration:2.0
                      delay:0.0
                    options:UIViewAnimatingOptionBeginFromCurrentState
                 animations:^(void){
                   controller.layer.backgroundColor = [UIColor blueColor].CGColor;
                 }
                 completion:NULL];

PS正如以前的帖子所指出的那样,确保你controller的继承自UIView.如果它是继承的UIViewController,请controller.view改用.