stringByReplacingOccurrencesOfString：不起作用(stringByReplacingOccurrencesOfString: doesn't work)

stringByReplacingOccurrencesOfString：不起作用(stringByReplacingOccurrencesOfString: doesn't work)

我希望我的输出为“23”，但它仍显示“123”。

NSString *valorTextField = [[NSString alloc] initWithFormat:@"123"]; [valorTextField stringByReplacingOccurrencesOfString:@"1" withString:@""]; NSLog(@"%@", valorTextField);

I want my output to be "23", but it still shows "123".

NSString *valorTextField = [[NSString alloc] initWithFormat:@"123"]; [valorTextField stringByReplacingOccurrencesOfString:@"1" withString:@""]; NSLog(@"%@", valorTextField);

最满意答案

stringByReplacingOccurrencesOfString返回一个新字符串：

NSString *valorTextField = [[NSString alloc] initWithFormat:@"123"]; NSString *replaced = [valorTextField stringByReplacingOccurrencesOfString:@"1" withString:@""]; NSLog(@"%@", replaced);

或者，您可以使用NSMutableString并使用replaceOccurrencesOfString:withString:options:range:方法。

stringByReplacingOccurrencesOfString returns a new string:

NSString *valorTextField = [[NSString alloc] initWithFormat:@"123"]; NSString *replaced = [valorTextField stringByReplacingOccurrencesOfString:@"1" withString:@""]; NSLog(@"%@", replaced);

Alternatively, you can work with a NSMutableString and use the replaceOccurrencesOfString:withString:options:range: method.