颜色的设置

16进制值的颜色

#define UIColorHexAlpha(rgbValue, alphaValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0x00FF00) >> 8))/255.0 blue:((float)(rgbValue & 0x0000FF))/255.0 alpha:alphaValue]

随机颜色

#define UIColorRandom [UIColor colorWithRed:arc4random_uniform(256) / 255.0f  green:arc4random_uniform(256) / 255.0f  blue:arc4random_uniform(256) / 255.0f  alpha:0.8];