iOS直接用代碼轉UIImage的2種方法分享

需要傳顔色和尺寸

- (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size
{
    //Create a context of the appropriate size
    UIGraphicsBeginImageContext(size);
    CGContextRef currentContext = UIGraphicsGetCurrentContext();
    
    //Build a rect of appropriate size at origin 0,0
    CGRect fillRect = CGRectMake(0, 0, size.width, size.height);
    
    //Set the fill color
    CGContextSetFillColorWithColor(currentContext, color.CGColor);
    
    //Fill the color
    CGContextFillRect(currentContext, fillRect);
    
    //Snap the picture and close the context
    UIImage *colorImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return colorImage;
}
           

不需要傳尺寸，隻需傳顔色

- (UIImage *)buttonImageFromColor:(UIColor *)color{
    CGRect rect = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}