Objective-C中的动画应用之三-优快云博客

本文介绍了一个简单的iOS应用示例，该应用中一个视图的颜色会在蓝色和红色间切换。通过触摸事件触发UIView的过渡动画实现颜色变化效果。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一个View，两个背景色，交替出现：

#import "ViewController.h"

@interface ViewController ()
{
    UIView *_contentView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    _contentView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 300, 300)];
    _contentView.backgroundColor = [UIColor redColor];
    [self.view addSubview:_contentView];
    self.view.backgroundColor = [UIColor blackColor];
    
    
    // Do any additional setup after loading the view, typically from a nib.
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
   [UIView transitionWithView:_contentView
                     duration:1
                      options:UIViewAnimationOptionTransitionFlipFromBottom|UIViewAnimationOptionAllowAnimatedContent
                   animations:^{
                       if(_contentView.backgroundColor == [UIColor blueColor]){
                           
                           _contentView.backgroundColor = [UIColor redColor];
                           
                       } else {
                       _contentView.backgroundColor = [UIColor blueColor];
                       }
                   } completion:nil];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end