iOS根据16进制的色号来设置颜色，适合封装工具类

iOS中有时候UI给的一个色号就像 #54e1b7 这个，而我们一般设置颜色都是根据RBG来设置的，所以这里需要把这个16进制的色号转为RGB值，这里我们就使用一下的方法来调用设置颜色。

 + (UIColor *)getColor:(NSString *)hexColor
 {
     if (hexColor == nil || hexColor.length == ) {
         NSLog(@"color string is nil.");
         return [UIColor blackColor];
     }
     unsigned int red,green,blue;
     NSRange range;
     range.length = ;

     range.location = ;
     NSString *deHexColor = [hexColor substringWithRange:range];
     [[NSScanner scannerWithString:deHexColor] scanHexInt:&red];

     range.location = ;
     deHexColor = [hexColor substringWithRange:range];
     [[NSScanner scannerWithString:deHexColor] scanHexInt:&green];

     range.location = ;
     deHexColor = [hexColor substringWithRange:range];
     [[NSScanner scannerWithString:deHexColor] scanHexInt:&blue];

     return [UIColor colorWithRed:(float)(red/255.0f) green:(float)(green / 255.0f) blue:(float)(blue / 255.0f) alpha:1.0f];
 }