iphone - iphone - format specifiers

Question

I am using this code from a guy

in the middle of this code, we have

- (NSString *)hexStringFromColor {
        return [NSString stringWithFormat:@"%0.6X", self.rgbHex];
}

This was working fine until Xcode 4.4. Now, I see this error: format specifies type unsigned int but the argument has type UInt32 (aka unsigned long).

Why is Xcode complaining in 4.4 but not before? what specifier should I use?

thanks.

Answer 1

由于rgbHex似乎是一个无符号长整数，因此正确的格式说明符@"%0.6lX"是l代表long.

iOS 字符串格式说明符列表。

Answer 2

Try %0.6lX，其中 'l' 指定后面的 'X' 是 long 而不是 int。ll如果值实际上是 long long，您也可以使用。