iOS 16进制颜色

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]