iOS高级动画CGAffine Transform

前言

前几天做项目遇到一个问题，一个之前同事用xib写的弹框，需要加一个缩放的动画效果，结果我用普通的改变frame的方法对其进行移动和缩放时，其内部的部分view没有随着父视图缩放，最后用CGAffine Transform解决该问题。

CGAffineTransformMakeTranslation

位移效果：有两个参数，分别是x、y坐标的偏移量

    [UIView animateWithDuration:1 animations:^{
        _testView.transform = CGAffineTransformMakeTranslation(100, 100);
    }];

CGAffineTransformMakeScale

等比缩放效果：两个参数，别是长、宽的缩放比例

    [UIView animateWithDuration:1 animations:^{
        _testView.transform = CGAffineTransformMakeScale(2.0f, 2.0f);
        _testView.transform = CGAffineTransformMakeScale(1.0, 1.0);
    }];

CGAffineTransformMakeRotation

旋转效果：一个参数，转的角度，用一个π的宏定义M_PI

    [UIView animateWithDuration:1.0f animations:^{
        CGAffineTransform transform1 = CGAffineTransformMakeRotation(M_PI_2);
        CGAffineTransform transform2 = CGAffineTransformScale(transform1, 0.5, 0.5);
        _testView.transform = CGAffineTransformTranslate(transform2, 100, 100);
    }];

CGAffineTransformConcat

组合动画：参数是两个CGAffineTransform，也就是说可以同时执行两个参数的动画效果

   [UIView animateWithDuration:0.5 animations:^{
                    weakPopLoginView.middleView.transform = CGAffineTransformConcat(CGAffineTransformMakeScale(0.01f, 0.01f), CGAffineTransformMakeTranslation(gifPoint.x - centerPoint.x, gifPoint.y - centerPoint.y));
                    weakPopLoginView.alpha = 0;
                }];