uiview 某点返回 色值 How to get the color of a pixel in an UIView?

// UIView+ColorOfPoint.h@interface UIView (ColorOfPoint)- (UIColor *) colorOfPoint:(CGPoint)point;@end// UIView+ColorOfPoint.m#import "UIView+ColorOfPoint.h"#import <QuartzCore/QuartzCore.h>@implementation UIView (ColorOfPoint)- (UIColor *) colorOfPoint:(CGPoint)point{    unsigned char pixel[4] = {0};    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    CGContextRef context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, kCGImageAlphaPremultipliedLast);    CGContextTranslateCTM(context, -point.x, -point.y);    [self.layer renderInContext:context];    CGContextRelease(context);    CGColorSpaceRelease(colorSpace);    //NSLog(@"pixel: %d %d %d %d", pixel[0], pixel[1], pixel[2], pixel[3]);    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;}@end

Link to files: https://github.com/ivanzoid/ikit/tree/master/UIView+ColorOfPoint