IOS 图片失真

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      1. 问题：图片过小，需要放大到合适尺寸

        //对图片进行压缩

        defaultStatusImg1 = [self scaleImage:defaultStatusImg1 toScale:1.5f];

       2. 问题：图片失真

        //图片失真

        defaultStatusImg1 =  [UIImage_Extend imageWithColor:[UIColor clearColor] withImage:defaultStatusImg1 withSize:itemRect.size withOffsetPoint:CGPointMake(34.f,5.f)];//offsetPoint可以使图片和文字对齐

- (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 * scaleSize, image.size.height * scaleSize)];

    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return scaledImage;   

}

前提：

1.导入framework－libuiframework.a

2.创建UIImage_Extend：

//  UIImage+Extend.h

#import <Foundation/Foundation.h>

@interface UIImage_Extend : NSObject

+(UIImage*)imageCroppedToFitSize:(CGSize)size withFileName:(NSString*)fileName;

+(UIImage *)imageCroppedToFitSize:(CGSize)size withData:(UIImage*)srcData;

+(UIImage*)imageCroppedToFitSizeII:(CGSize)size withData:(UIImage *)srcData;

+(UIImage*)imageCroppedToFitSizeII:(CGSize)size withFileName:(NSString*)fileName;

+(UIImage*)imageScaleToFitSize:(CGSize)size withFileName:(NSString*)fileName;

+(UIImage*)imageScaleToFitSize:(CGSize)size withData:(UIImage*)srcData;

+(UIImage *)makeRoundCornerImage:(UIImage*)img :(int) cornerWidth :(int) cornerHeight;

+(UIImage *)imageWithColor:(UIColor *)color;

+(UIImage *)imageWithColor:(UIColor *)color  withImage:(UIImage*)contentImage withSize:(CGSize)size;

+(UIImage *)imageWithColor:(UIColor *)color  withImage:(UIImage*)contentImage withSize:(CGSize)size withOffsetPoint: (CGPoint)point;

@end

IOS 图片失真

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原文地址：http://www.cnblogs.com/yuyu-2012/p/4977855.html