这是测试项目中主视图控制器的viewDidLoad：
- (void)viewDidLoad
{
[super viewDidLoad];
UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(10,10,300,300)];
[self.view addSubview:containerView];
UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(0,300)];
[redView setBackgroundColor:[UIColor redColor]];
[containerView addSubview:redView];
UIView *yellowView = [[UIView alloc] initWithFrame:CGRectMake(0,300)];
[yellowView setBackgroundColor:[UIColor yellowColor]];
[UIView transitionWithView:containerView duration:3
options:UIViewAnimationoptionTransitionFlipFromLeft animations:^{
[redView removeFromSuperview];
[containerView addSubview:yellowView];
}
completion:NULL];
}
刚出现黄色框.没有动画,无论我尝试哪种UIViewAnimationoption.为什么？？？
编辑：我也尝试使用performSelector withDelay将动画移出viewDidLoad并转移到另一个方法.相同的结果 – 没有动画.
还试过这个：
[UIView transitionFromView：redView toView：yellowView duration：3选项：UIViewAnimationoptionTransitionFlipFromLeft completion：NULL];
然而,黄色视图才出现.没有动画.
解决方法
经过一些测试后,您似乎无法创建容器视图并在同一个runloop中设置动画并使其工作正常.为了使您的代码有效,我首先在viewDidLoad方法中创建了containerView和redView.然后我将你的动画放入viewDidAppear方法.因此我可以从viewDidAppear方法引用containerView和redView,我将它们作为属性.以下是ST_ViewController.m文件的代码,该文件将执行您想要的动画.
@interface ST_ViewController ()
@property (nonatomic,strong) UIView *containerView;
@property (nonatomic,strong) UIView *redView;
@end
@implementation ST_ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[self setContainerView:[[UIView alloc] initWithFrame:CGRectMake(10,300)]];
[[self view] addSubview:[self containerView]];
[self setRedView:[[UIView alloc] initWithFrame:CGRectMake(0,300)]];
[[self redView] setBackgroundColor:[UIColor redColor]];
[[self containerView] addSubview:[self redView]];
}
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
UIView *yellowView = [[UIView alloc] initWithFrame:CGRectMake(0,300)];
[yellowView setBackgroundColor:[UIColor yellowColor]];
[UIView transitionWithView:[self containerView]
duration:3
options:UIViewAnimationoptionTransitionFlipFromLeft
animations:^(void){
[[self redView] removeFromSuperview];
[[self containerView] addSubview:yellowView];
}
completion:nil];
}
@end