iOS 特定图片的按钮的旋转动画

来源：互联网发布：希腊神话读后感知乎编辑：程序博客网时间：2024/05/01 23:24

最近做的东西中，要为一个有特定图片的按钮添加旋转动画，Demo代码如下：

#import "ViewController.h"@interface ViewController () {    BOOL flag;}@property (strong, nonatomic) UIImageView *imageView;@end@implementation ViewController            - (void)viewDidLoad {    [super viewDidLoad];        flag = YES;        self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 35, 35)];    UIImage *aImage = [UIImage imageNamed:@"down.png"];    [_imageView setImage:aImage];    _imageView.center = self.view.center;    [self.view addSubview:_imageView];        UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    [button setTitle:@"旋转" forState:UIControlStateNormal];    [button addTarget:self action:@selector(rotate:) forControlEvents:UIControlEventTouchUpInside];    button.frame = CGRectMake(110, 400, 100, 44);    [self.view addSubview:button];}- (void)rotate:(id)sender {    if (flag) {        [UIView animateWithDuration:0.5 animations:^{            _imageView.transform = CGAffineTransformMakeRotation(M_PI);        } completion:^(BOOL finished) {            flag = NO;        }];    }    else {        [UIView animateWithDuration:0.5 animations:^{            _imageView.transform = CGAffineTransformMakeRotation(0);        } completion:^(BOOL finished) {            flag = YES;        }];    }}@end

运行时真机设备和模拟器的按钮旋转动画中，方向可能有点不同，有点奇怪。

其中一些运行截图如下：

Demo地址：点击打开链接

0 0