Android RGB颜色转换 iOS的UIColor

       对于开发文档而言,但部分手机移动项目 所标注的色值都是 RGB颜色,词对于Android开发人员来讲十分方便尔对于iOS开发人员来讲十分麻烦

       OC是基于C的扩张,所以C语言在OC之中能够无缝的调用,对于转换能够采用 位移 和 与 来实现完美转换

1.采用宏定义

       #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]

2.采用类别

   @interface UIColor (ColorFromRGB)
/*
示例: 使用十六进制的颜色 0x000000~0xffffff
self.view.backgroundColor = [UIColor colorFromRGB:0x0000ff];
*/
+(UIColor *) colorFromRGB:(int) RGBValue;
-(UIColor *) colorFromRGB:(int) RGBValue ;
-(UIColor *) colorFromRGB:(int) RGBValue alpha:(CGFloat) alpha;
@end

@implementation UIColor (ColorFromRGB)
+(UIColor *)colorFromRGB:(int)RGBValue
{
   return [UIColor colorWithRed:(float)((RGBValue&0xFF0000)>>16)/255.0 green:(float)((RGBValue&0xFF00)>>8)/255.0 blue:(float)((RGBValue&0xFF))/255.0 alpha:1.0f];
}
-(UIColor *)colorFromRGB:(int)RGBValue alpha:(CGFloat)alpha
{
return [UIColor colorWithRed:(float)((RGBValue&0xFF0000)>>16)/255.0 green:(float)((RGBValue&0xFF00)>>8)/255.0 blue:(float)((RGBValue&0xFF))/255.0 alpha:alpha];
}
-(UIColor *)colorFromRGB:(int)RGBValue
{
   return [self colorFromRGB:RGBValue alpha:1.0f];
}
@end