使用方法：导入头文件，调用
self.backgroundColor= [UIColorrandomColor];
.h 文件
#import <UIKit/UIKit.h>
@interfaceUIColor (additions)
+ (UIColor*)randomColor;
@end
.m 文件
#import"UIColor+additions.h"
@implementationUIColor (additions)
+ (UIColor*)randomColor
{
CGFloathue = (arc4random() %256/256.0);
CGFloatsaturation = (arc4random() %128/256.0) +0.5;
CGFloatbrightness = (arc4random() %128/256.0) +0.5;
UIColor*color = [UIColorcolorWithHue:huesaturation:saturationbrightness:brightnessalpha:1];
returncolor;
}
@end
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