Question

从NSMutableString中删除空格时遇到问题。我正在使用这样的代码：

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    if(!myMutableStringSiteObj)
        myMutableStringSiteObj = [[NSMutableString alloc] initWithString:string];
    else
    {
        [myMutableStringSiteObj appendString:string];
        NSString *trimmedString = [myMutableStringSiteObj stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        [myMutableStringSiteObj setString:trimmedString];

        NSData *datasite = [myMutableStringSiteObj dataUsingEncoding:NSUTF8StringEncoding];
        responseSitedict = [NSJSONSerialization JSONObjectWithData:datasite options:0 error:nil];
        NSLog(@"JSON DATA = %@",responseSitedict);
    }

    myMutableStringObj=[[NSMutableString alloc]initWithString:string];
    NSLog(@"Array String: %@",myMutableStringObj);
    NSData *data = [myMutableStringObj dataUsingEncoding:NSUTF8StringEncoding];
    responsedict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    NSLog(@"JSON DATA = %@",responsedict);

    myMutableStringbranchObj=[[NSMutableString alloc]initWithString:string];
    NSLog(@"Array String: %@",myMutableStringbranchObj);
    NSData *databranch = [myMutableStringbranchObj dataUsingEncoding:NSUTF8StringEncoding];
    responsebranchdict = [NSJSONSerialization JSONObjectWithData:databranch options:0 error:nil];
    NSLog(@"JSON DATA = %@",responsebranchdict);
}

在这段代码中有三个字符串，一个字符串包含空格，另外两个字符串不包含空格。首先，它需要myMutableStringObj的Id，然后是myMutableStringbranchObj，然后是myMutableStringSiteObj。但是当它来到myMutableStringSiteObj应用程序时会崩溃，因为它包含空格。但修剪字符串的代码不起作用。

Answer 1

如果你想修剪一个字符串（删除第一个和最后一个空格），那么你可以使用以下函数。

 NSString *newString = [yourString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

Answer 2

试试这个有效 NSString * Spacetrimmed = [foo stringByTrimmingCharactersInSet：[NSCharacterSet whitespaceCharacterSet]];

当不在Objective-C中修剪其他NSMutableString时，如何修剪NSMutableString

2 个答案: