图片简单处理

图片拉伸和尺寸变换 图片拉伸 ： - (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight; 一般 leftCapWidth = imageWidth *.5f, topCapHeight = imageWidth * .5f; 尺寸变换： //resize图片 - (UIImage *)reSizeImage:(UIImage *)image toSize:(CGSize)reSize{ UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height)); [image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)]; UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return reSizeImage; } 图片的处理大概分 截图(capture), 缩放(scale), 设定大小(resize), 存储(save) 1.等比率缩放 -