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//UIImage对象转化为base64字符串
- (NSString *)toBase64String:(CGFloat)compressionQuality
{
    NSData *data = UIImageJPEGRepresentation(self, compressionQuality);
    NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
    return encodedImageStr;
}

//base64 string 转 UIImage 对象
+ (UIImage *)imageWithBase64String:(NSString *)base64string
{
    NSData *decodedImageData = [[NSData alloc]
                                initWithBase64EncodedString:base64string options:NSDataBase64DecodingIgnoreUnknownCharacters];
    UIImage *decodedImage = [UIImage imageWithData:decodedImageData];
    
    return decodedImage;
}

//获取纯色图片
+ (UIImage *)imageWithColor:(UIColor *)color {
    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

//生成新的放大后的UIImage
- (UIImage *)scale:(float)scaleSize
{
    UIGraphicsBeginImageContext(CGSizeMake(self.size.width * scaleSize, self.size.height * scaleSize));
    
    [self drawInRect:CGRectMake(0, 0, self.size.width * scaleSize, self.size.height * scaleSize)];
    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return scaledImage;
}