[转]裁剪图片为正方形
Posted YouNeedCourage
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原文：http://www.cnblogs.com/shisishao/p/6000999.html
#pragma mark 获取裁剪区域
- (CGRect)getImageRect:(UIImage *)tempImage {
CGRect rect;
if (tempImage.size.width > tempImage.size.height) {
rect = CGRectMake((tempImage.size.width-tempImage.size.height)/2, 0, tempImage.size.height, tempImage.size.height);
} else if (tempImage.size.width < tempImage.size.height) {
rect = CGRectMake(0, (tempImage.size.height-tempImage.size.width)/2, tempImage.size.width, tempImage.size.width);
} else {
rect = CGRectMake(0, 0, tempImage.size.width, tempImage.size.width);
}
return rect;
}
#pragma mark 裁剪图片
- (UIImage *)getCropImage:(UIImage *)image andRect:(CGRect)rect {
rect = CGRectMake(ceilf(rect.origin.x), ceilf(rect.origin.y), ceilf(rect.size.width), ceilf(rect.size.height));
UIGraphicsBeginImageContext(rect.size);
[image drawAtPoint:CGPointMake(-rect.origin.x, -rect.origin.y)];
UIImage *cropImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return cropImage;
}
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