iOS RGB颜色设置

UIColor * color = [UIColor colorWithRed:(x/255.0f) green:( y/255.0f)blue:(z/255.0f) alpha:1.0f];

x,y,z的值参见RGB颜色表 http://www.th7.cn/Program/IOS/201411/320219.shtml
一个宏

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

UIColorFromRGB(0xF3F4F6); 0x＝html的#

1.生成随机颜色

- (UIColor *)randomColor {

static BOOL seeded = NO;

if (!seeded) {

seeded = YES;

(time(NULL));

}

CGFloat red = (CGFloat)random() / (CGFloat)RAND_MAX;

CGFloat green = (CGFloat)random() / (CGFloat)RAND_MAX;

CGFloat blue = (CGFloat)random() / (CGFloat)RAND_MAX;

return [UIColor colorWithRed:red green:green blue:blue alpha:1.0f];

}