iOS中改变UIImage的颜色和大小的方法

#import <UIKit/UIKit.h>

@interface UIImage (UIImage_ChangeColor)

- (UIImage *)changeImageColorWithColor:(UIColor *)color;

- (UIImage *)reSizeImage:(UIImage *)image toSize:(CGSize)reSize;

@end

#import "UIImage+UIImage_ChangeColor.h"

@implementation UIImage (UIImage_ChangeColor)

- (UIImage *)changeImageColorWithColor:(UIColor *)color
{

UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0, self.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetBlendMode(context, kCGBlendModeNormal);
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextClipToMask(context, rect, self.CGImage);
[color setFill];
CGContextFillRect(context, rect);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;

}

- (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;
}