判断颜色是不是亮色

//判断颜色是不是亮色

-(BOOL) isLightColor:(UIColor*)clr {

CGFloat components[3];

[self getRGBComponents:components forColor:clr];

NSLog(@"%f %f %f", components[0], components[1], components[2]);

CGFloat num = components[0] + components[1] + components[2];

if(num < 382)

return NO;

else

return YES;

}

//获取RGB值

- (void)getRGBComponents:(CGFloat [3])components forColor:(UIColor *)color {

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1

int bitmapInfo = kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedLast;

#else

int bitmapInfo = kCGImageAlphaPremultipliedLast;

#endif

CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();

unsigned char resultingPixel[4];

CGContextRef context = CGBitmapContextCreate(&resultingPixel,

1,

1,

8,

4,

rgbColorSpace,

bitmapInfo);

CGContextSetFillColorWithColor(context, [color CGColor]);

CGContextFillRect(context, CGRectMake(0, 0, 1, 1));

CGContextRelease(context);

CGColorSpaceRelease(rgbColorSpace);

for (int component = 0; component < 3; component++) {

components[component] = resultingPixel[component];

}

}