iOS实现旋转

最新推荐文章于 2020-12-28 21:23:50 发布

转载最新推荐文章于 2020-12-28 21:23:50 发布 · 83 阅读

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原文链接：https://my.oschina.net/u/1782374/blog/395679

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#python

本文介绍了一个使用Objective-C实现的iOS视图旋转动画案例。通过UIViewController的viewDidLoad方法，在视图加载完成后设置UILabel并实现其顺时针180度旋转动画及还原动画的循环播放。文中展示了如何创建UILabel并设置其属性，以及如何使用UIView的animateWithDuration方法来实现旋转动画。

2019独角兽企业重金招聘Python工程师标准>>>

#import "ViewController.h"

@interface ViewController ()
@property (strong, nonatomic)UILabel *label;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    CGRect labelFrame = CGRectMake(100, 100,100, 50);
    self.label = [[UILabel alloc] initWithFrame:labelFrame];
    self.label.font = [UIFont fontWithName:@"Helvetica" size:36];
    self.label.text = @"XxxX";
    self.label.textAlignment = NSTextAlignmentCenter;
    self.label.backgroundColor = [UIColor brownColor];
    [self.view addSubview:self.label];
    [self rotateLabelDown];
}

- (void)rotateLabelDown{
    [UIView animateWithDuration:10 animations:^{
        self.label.layer.anchorPoint = CGPointMake(0.5, 0.5);
        //self.label.transform = CGAffineTransformMakeRotation(-90);  //逆时针旋转
        self.label.transform = CGAffineTransformMakeRotation(M_PI);
    } completion:^(BOOL finished) {
        [self rotateLabelUp];
    }];
}

- (void)rotateLabelUp{
    [UIView animateWithDuration:10 animations:^{
        self.label.layer.anchorPoint = CGPointMake(0.5, 0.5);
        self.label.transform = CGAffineTransformMakeRotation(0);
    } completion:^(BOOL finished) {
        [self rotateLabelDown];
    }];
}

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

@end

转载于:https://my.oschina.net/u/1782374/blog/395679