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uiimAgE sCAlE

- (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize { UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize); [image drawInRect:CGRectMake(0, 0, image.size.width * scal...

UIImage类没有提供修改frame的方法,我们需要扩展UIImage类自己实现 @interface UIImage (Scale) -(UIImage *)TransformtoSize:(CGSize)Newsize; @end //UIImage.m #import "UIImage.h" @implementation UIImage (Scale) - (UIImage *)scaleToSi...

- (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize { UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize); [image drawInRect:CGRectMake(0, 0, image.size.width * scal...

两种缩放: 1.缩放到指定大小,也就是指定的`size`. 2.等比缩放。 缩放到指定大小 -(UIImage*)imageCompressWithSimple:(UIImage*)imagescaledToSize:(CGSize)size { UIGraphicsBeginImageContext(size); [imagedrawInRect:CGRectMake(0,0,size.w...

‍ // 在某个区域截图 - (UIImage*)grabImageWithRect:(CGRect)rect { CGFloat scale = self.scale; CGRect rectTemp = CGRectMake(rect.origin.x*scale, rect.origin.y *scale, rect.size.width *scale, rect.size.height*scale); CGImage...

肯定是会改变的!

4、+ (UIImage *)imageWithCGImage:(CGImageRef)cgImage//使用Quartz 2D对象创建UIImage5、+ (UIImage *)imageWithCGImage:(CGImageRef)imageRef scale:(CGFloat)scale...

1.等比率缩放 - (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize { UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scale...

然后UIImage * imgUI = [UIImage imageWithCGImage:imgRef];时, 用那个带多参数的方法, 其中scale给2.0当然, 为了自适应retina和普通屏, 可以对创建Context时的...

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