截图

#pragma mark --裁剪

- (UIImage *)handleImage:(UIImage *)originalImage withSize(CGSize)size

{  }

- (UIImage *)handleImage:(UIImage *)originalImage withSize:(CGSize )size {

CGSize originalsize = [originalImage size];

NSLog(@"高度 == %f  宽度 == %f", originalsize.height,originalsize.width);

//原图长|宽均小于标准长宽的,不作处理 直接返回

if (originalsize.width < size.width && originalsize.height < size.height) {

return originalImage;

}

//原图长宽均大于标准长|宽,按比例适配

else if (originalsize.width > size.width && originalsize.height > size.height) {

CGFloat rate = 1.f;

CGFloat widthRate = originalsize.width/originalsize.height;//宽:高

CGFloat heightRate = originalsize.height/originalsize.width;//高:宽

rate = widthRate > heightRate ? heightRate:widthRate;

CGImageRef imageRef = nil;

if (heightRate > widthRate)

{

imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(0, originalsize.height/2 - size.height *rate/2, originalsize.width, size.height*rate));//获取图片整体部分

}

else

{

imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(originalsize.width/2 - size.width*rate/2, 0, size.width*rate, originalsize.height));//获取图片整体部分

}

UIGraphicsBeginImageContext(size);//指定要绘画图片的大小

CGContextRef con = UIGraphicsGetCurrentContext();

CGContextTranslateCTM(con, 0.0, size.height);

CGContextScaleCTM(con, 1.0, -1.0);

CGContextDrawImage(con, CGRectMake(0, 0, size.width, size.height), imageRef);

UIImage * standardImage = UIGraphicsGetImageFromCurrentImageContext();

NSLog(@"裁剪之后的图片: 宽度 %f  高度 %f",[standardImage size].width,[standardImage size].height);

UIGraphicsEndImageContext();

CGImageRelease(imageRef);

return standardImage;

}

//原图长|宽有一项大于标准长|宽的,对大于标准的那一项进行裁剪,另一项保持不变

else if (originalsize.width > size.width || originalsize.height > size.height) {

CGImageRef imageRef = nil;

//高度大于标准高度

if (originalsize.height > size.height) {

imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(0, originalsize.height/2 - size.height/2, originalsize.width, size.height));//获取图片整体部分

}

else if (originalsize.width > size.width) {

imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(originalsize.width/2 - size.width/2, 0, size.width, originalsize.height));//获取图片整体部分

}

UIGraphicsBeginImageContext(size);//指定要绘画图片的大小

CGContextRef con = UIGraphicsGetCurrentContext();

CGContextTranslateCTM(con, 0.0, size.height);

CGContextScaleCTM(con, 1.0, -1.0);

CGContextDrawImage(con, CGRectMake(0, 0, size.width, size.height), imageRef);

UIImage *standardImage = UIGraphicsGetImageFromCurrentImageContext();

NSLog(@"裁剪之后的图片⭐️: 宽度 %f  高度 %f",[standardImage size].width,[standardImage size].height);

UIGraphicsEndImageContext();

CGImageRelease(imageRef);

return standardImage;

}

//原图为标准长宽的,不做处理

return originalImage;

}