获取屏幕点的颜色值

- (UIColor *)colorOfPoint:(CGPoint)point {
    unsigned char pixel[4] = {0};
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, (CGBitmapInfo)kCGImageAlphaPremultipliedLast);
    
    CGContextTranslateCTM(context, -point.x, -point.y);
    
    [self.view.layer renderInContext:context];
    
    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);
    
    UIColor *color = [UIColor colorWithRed:pixel[0]/255.0 green:pixel[1]/255.0 blue:pixel[2]/255.0 alpha:pixel[3]/255.0];
    
    return color;
}
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