iOS开发改变图片颜色

第一种方法

+ (UIImage *)changeImage:(UIImage *)img withColor:(UIColor *)color {
    // 获取画布
    UIGraphicsBeginImageContextWithOptions(img.size, NO, img.scale);
    CGContextRef context = UIGraphicsGetCurrentContext();
    //移动图片
    CGContextTranslateCTM(context, 0, img.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);
    //模式配置
    CGContextSetBlendMode(context, kCGBlendModeNormal);
    CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
    CGContextClipToMask(context, rect, img.CGImage);
    [color setFill];
    CGContextFillRect(context, rect);
    //创建获取图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

第二种方法，创建一个UIImage的Category

.h文件
@interface UIImage (ChangeColor)

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

@end

.m文件
@implementation UIImage (ChangeColor)

- (UIImage *)imageChangeColor:(UIColor *)color {
    //获取画布
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
    //画笔沾取颜色
    [color setFill];
    CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height);
    UIRectFill(bounds);
    //绘制一次
    [self drawInRect:bounds blendMode:kCGBlendModeOverlay alpha:1.0f];
    //再绘制一次
    [self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0f];
    //获取图片
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

@end