iOS 16进制颜色转换10进制颜色

+(UIColor *)colorWithHexString:(NSString *)coloStr{

//    检索  去下空格和换行 转成大写

NSString *cString = [[coloStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

if (cString.length<6) {

return [UIColor clearColor];

}

//  看以什么开头

if ([cString hasPrefix:@"0X"]) {

cString = [cString substringFromIndex:2];

}

if ([cString hasPrefix:@"#"]) {

cString = [cString substringFromIndex:1];

}

if ([cString length] != 6) {

return [UIColor clearColor];

}

//    截取字符串

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];

//    16进制转化10进制

unsigned int r , g , b ;

[[NSScanner scannerWithString:rString] scanHexInt:&r];

[[NSScanner scannerWithString:gString] scanHexInt:&g];

[[NSScanner scannerWithString:bString] scanHexInt:&b];

return [UIColor colorWithRed:((float)r/255.0f) green:((float)g/255.0f) blue:((float)b/255.0f) alpha:1.0];

}