1,#000000格式
添加个UIColor分类
- (UIColor *) colorWithHexString: (NSString *) stringToConvert
{
NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]uppercaseString];//字符串处理
//例子，stringToConvert #ffffff
if ([cString length] <6)
return [UIColor redColor];//如果非十六进制，返回白色
if ([cString hasPrefix:@"#"])
cString = [cString substringFromIndex:1];//去掉头
if ([cString length] !=6)//去头非十六进制，返回白色
return [UIColor greenColor];
//分别取RGB的值
NSRange range;
range.location =0;
range.length =2;
NSString *rString = [cString substringWithRange:range];
range.location =2;
NSString *gString = [cString substringWithRange:range];
range.location =4;
NSString *bString = [cString substringWithRange:range];
unsigned int r, g, b;
//NSScanner把扫描出的制定的字符串转换成Int类型
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
//转换为UIColor
return [UIColor colorWithRed:((float) r /255.0f)
green:((float) g /255.0f)
blue:((float) b /255.0f)
alpha:1.0f];
}
2,0x000000格式
宏定义
//RGB颜色转换 （16进制->10进制）
#define UIColorFromRGBA(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]
