iOS 9.2.1, Xcode 7.2.1, ARC启用

您总是可以单独追加'%'，而不需要在追加的字符串中添加任何其他格式说明符，如下所示…

int test = 10;

NSString *stringTest = [NSString stringWithFormat:@"%d", test];
stringTest = [stringTest stringByAppendingString:@"%"];
NSLog(@"%@", stringTest);

iOS7.0 +

要将答案扩展到其他可能导致冲突的字符，您可以选择使用:

- (NSString *)stringByAddingPercentEncodingWithAllowedCharacters:(NSCharacterSet *)allowedCharacters

一步一步写出来是这样的:

int test = 10;

NSString *stringTest = [NSString stringWithFormat:@"%d", test];
stringTest = [[stringTest stringByAppendingString:@"%"] 
             stringByAddingPercentEncodingWithAllowedCharacters:
             [NSCharacterSet alphanumericCharacterSet]];
stringTest = [stringTest stringByRemovingPercentEncoding];

NSLog(@"percent value of test: %@", stringTest);

或简称:

NSLog(@"percent value of test: %@", [[[[NSString stringWithFormat:@"%d", test] 
stringByAppendingString:@"%"] stringByAddingPercentEncodingWithAllowedCharacters:
[NSCharacterSet alphanumericCharacterSet]] stringByRemovingPercentEncoding]);

感谢所有的原创贡献者。希望这能有所帮助。干杯!

iOS 9.2.1, Xcode 7.2.1, ARC启用

您总是可以单独追加'%'，而不需要在追加的字符串中添加任何其他格式说明符，如下所示…

int test = 10;

NSString *stringTest = [NSString stringWithFormat:@"%d", test];
stringTest = [stringTest stringByAppendingString:@"%"];
NSLog(@"%@", stringTest);

iOS7.0 +

要将答案扩展到其他可能导致冲突的字符，您可以选择使用:

- (NSString *)stringByAddingPercentEncodingWithAllowedCharacters:(NSCharacterSet *)allowedCharacters

一步一步写出来是这样的:

int test = 10;

NSString *stringTest = [NSString stringWithFormat:@"%d", test];
stringTest = [[stringTest stringByAppendingString:@"%"] 
             stringByAddingPercentEncodingWithAllowedCharacters:
             [NSCharacterSet alphanumericCharacterSet]];
stringTest = [stringTest stringByRemovingPercentEncoding];

NSLog(@"percent value of test: %@", stringTest);

或简称:

NSLog(@"percent value of test: %@", [[[[NSString stringWithFormat:@"%d", test] 
stringByAppendingString:@"%"] stringByAddingPercentEncodingWithAllowedCharacters:
[NSCharacterSet alphanumericCharacterSet]] stringByRemovingPercentEncoding]);

感谢所有的原创贡献者。希望这能有所帮助。干杯!

如果在某些情况下有帮助，可以使用unicode字符:

NSLog(@"Test percentage \uFF05");

百分号的转义代码是“%%”，所以代码看起来像这样

[NSString stringWithFormat:@"%d%%", someDigit];

此外，所有其他格式说明符都可以在Conceptual Strings Articles中找到

请使用以下代码。

 NSString *searchText = @"Bhupi"
 NSString *formatedSearchText = [NSString stringWithFormat:@"%%%@%%",searchText];

将输出:%Bhupi%

NSString格式中百分号的代码是%%。NSLog()和printf()格式也是如此。