IOS开发UI篇--仿射变换(CGAffineTransform)使用小结

一、理论基础

请参考CGAffineTransform简单分析

二、效果演示

IOS开发UI篇--仿射变换(CGAffineTransform)使用小结_第1张图片

三、实现代码

3.1:位移变换

-(void)positionAnimation{     _demoView.transform = CGAffineTransformIdentity;
    [UIView animateWithDuration:1.0f animations:^{
        _demoView.transform = CGAffineTransformMakeTranslation(100, 100);
    }];
}

3.2:缩放变换

-(void)scaleAnimation{     _demoView.transform = CGAffineTransformIdentity;
    [UIView animateWithDuration:1.0f animations:^{
        _demoView.transform = CGAffineTransformMakeScale(2, 2);
    }];
}

3.3:旋转变换

-(void)rotateAnimation{     _demoView.transform = CGAffineTransformIdentity;
    [UIView animateWithDuration:1.0f animations:^{
        _demoView.transform = CGAffineTransformMakeRotation(M_PI);
    }];
}

3.4:组合变换

-(void)combinationAnimation{
    //仿射变换的组合使用
    _demoView.transform = CGAffineTransformIdentity;
    [UIView animateWithDuration:1.0f animations:^{
        CGAffineTransform transform1 = CGAffineTransformMakeRotation(M_PI);
        CGAffineTransform transform2 = CGAffineTransformScale(transform1, 0.5, 0.5);
        _demoView.transform = CGAffineTransformTranslate(transform2, 100, 100);
    }];
}

3.5:矩阵的反转

-(void)invertAnimation{
    _demoView.transform = CGAffineTransformIdentity;
    [UIView animateWithDuration:1.0f animations:^{
        //矩阵反转
        _demoView.transform = CGAffineTransformInvert(CGAffineTransformMakeScale(2, 2));
    }];
}

四、补充

  • CGAffineTransformIdentity : 单位矩阵变换,一般用于仿射变换的初始化或者还原。
  • CGAffineTransformEqualToTransform(CGAffineTransform t1,
    CGAffineTransform t2) : 判断两个变换矩阵是否相等

  • CGAffineTransformConcat(CGAffineTransform t1,
    CGAffineTransform t2) : 得到两个矩阵相加后得到的最终矩阵

  • CGPoint CGPointApplyAffineTransform(CGPoint point,
    CGAffineTransform t) : 某点通过矩阵变换之后的点

  • CGSize CGSizeApplyAffineTransform(CGSize size, CGAffineTransform t) : 某个size通过矩阵变换之后的size

  • CGRect CGRectApplyAffineTransform(CGRect rect, CGAffineTransform t) : 某个Rect通过矩阵变换之后的区域

五、Demo下载地址

github下载地址
感觉对你还有点帮助,star一下吧。

六、联系方式

微博:新浪微博
博客:http://blog.csdn.net/yixiangboy
github:https://github.com/yixiangboy

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