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获取某一点的颜色

2022-04-22 23:52:00 【~废弃回忆 �༄】


@implementation UIView (****)
/** 获取某一点的颜色*/
- (UIColor *)colorWithPoint:(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.layer renderInContext:context];
    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);
    return [UIColor colorWithRed:pixel[0]/255.0 green:pixel[1]/255.0 blue:pixel[2]/255.0 alpha:pixel[3]/255.0];
}

@end