动画-图片旋转

原创于 2013-05-13 11:28:51 发布 · 258 阅读

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本文介绍如何使用 Core Animation 在 iOS 应用中实现 UIImageView 的旋转动画效果，并提供了暂停动画的方法。通过设置 CABasicAnimation 并应用 CATransform3D 实现了无限循环的旋转动画。

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旋转：


iv = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 300, 300)];
    [iv setImage:[UIImage imageNamed:@"dial_panel"]];
    //CALayer *rotate_layer = iv.layer;
    [self.view addSubview:iv];
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
    animation.delegate = self;
    animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI , 0, 0, 1.0)];
    animation.duration = 1;
    animation.cumulative = YES;
    animation.repeatCount = INT_MAX;
    animation.speed = 10;
    [iv.layer addAnimation:animation forKey:@"animation"];

暂定：


    CFTimeInterval pausedTime = [iv.layer convertTime:CACurrentMediaTime() fromLayer:nil];
    iv.layer.speed = 0.0;
    iv.layer.timeOffset = pausedTime;