用另一个动画大小更改替换子视图答案

【问题标题】：Replace subview with another, animating size change用另一个动画大小更改替换子视图
【发布时间】：2015-05-20 08:53:14
【问题描述】：

我有一个包含一个子视图的容器视图。我想用另一个大小与原始大小不同的视图替换这个子视图，因此容器也应该调整大小。这就是我想要做的事情

UIView *content = NEW_CONTENT;
content.translatesAutoresizingMaskIntoConstraints = NO;

[self.contentContainer layoutIfNeeded]; // the container view

// make the old content disappear first
[UIView animateWithDuration:0.3
                 animations:^{
                     UIView *oldContent = [self.contentContainer.subviews firstObject];
                     oldContent.alpha = 0.0f;
                 }
                 completion:^(BOOL finished) {
                     // then replace it with a new content
                     [UIView transitionWithView:self.contentContainer
                                       duration:0.1
                                        options:0
                                     animations:^{
                                         [[self.contentContainer.subviews firstObject] removeFromSuperview];
                                         [self.contentContainer addSubview:content];
                                         [content autoPinEdgesToSuperviewEdgesWithInsets:UIEdgeInsetsZero];

                                         [self.contentContainer layoutIfNeeded];
                                     }
                                     completion:^(BOOL finished) { // completion stuff}];
                 }];

旧的内容不透明度动画正确，但布局更改时没有任何动画。我该如何解决？

【问题讨论】：

标签： ios objective-c autolayout uikit

【解决方案1】：

//3 个视图(container,first,second) 在 viewdidload 中分配

UIView *container=[[UIView alloc] initWithFrame:CGRectMake(20, 20, 250, 300)];
container.backgroundColor=[UIColor redColor];
[self.view addSubview: container];

UIView *first=[[UIView alloc] initWithFrame:CGRectMake(100, 50, 100, 100)];
first.backgroundColor=[UIColor blueColor];
[self.view addSubview: first];

UIView *second=[[UIView alloc] initWithFrame:CGRectMake(50, 50, 200, 150)];
second.backgroundColor=[UIColor purpleColor];
second.alpha=0;
[self.view addSubview: second];

//删除第一个视图并更改容器框架并添加第二个视图的动画功能

[UIView transitionWithView:first duration:1.0 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
    first.alpha=0.0;

} completion:^(BOOL finished) {
    [UIView transitionWithView:second duration:1.0 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
        container.frame=CGRectMake(50, 10, 100, 200);
        second.alpha=1.0;

    } completion:^(BOOL finished) {

    }];
}];

我想你正在尝试同样的场景。它在我的情况下完美运行

【讨论】：