oc 提取图片中的颜色

一、下载地址

下载：https://github.com/puyangdev/PYColorPicker

二、 效果

三、关键代码

//获取图片某一点的颜色
- (UIColor *)colorAtPixel:(CGPoint)point {
    if (!CGRectContainsPoint(CGRectMake(0.0f, 0.0f, self.image.size.width, self.image.size.height), point)) {
        return nil;
    }
    
    NSInteger pointX = trunc(point.x);
    NSInteger pointY = trunc(point.y);
    CGImageRef cgImage = self.image.CGImage;
    NSUInteger width = self.image.size.width;
    NSUInteger height = self.image.size.height;
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    int bytesPerPixel = 4;
    int bytesPerRow = bytesPer