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