如何从NSString中删除第一个空格?

使用 rangeOfString: 要定位第一个空间,请使用 stringByReplacingCharactersInRange:withString:

使用以下代码删除空格。

NSString *str = @"IF_Distance (GET_Mi mi=km*1.4,STRING1,STRING2)";

NSString *secondString = [str stringByReplacingOccurrencesOfString:@"IF_Distance " withString:@"IF_Distance"];

NSString *str = @"IF_Distance (GET_Mi mi=km*1.4,STRING1,STRING2)";
NSString *firstStringContainingSpace = [[str componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] firstObject];//firstStringContainingSpace = IF_Distance

str = [str stringByReplacingCharactersInRange:[str rangeOfString:[NSString stringWithFormat:@"%@ ",firstStringContainingSpace]] withString:firstStringContainingSpace];

str=@“IF_Distance(GET_Mi Mi=km*1.4,STRING1,STRING2)”;

首先使用查找空间 rangeOfString: 然后使用 stringByReplacingCharactersInRange:withString:

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NSString *str = @"IF_Distance (GET_Mi mi=km*1.4,STRING1,STRING2)";
NSString *strSpace = @" ";

NSRange range = [str rangeOfString:strSpace];
NSString *strFinal;

if (NSNotFound != range.location) {

     strFinal = [str stringByReplacingCharactersInRange:range withString:@""];
}

如果您正在寻找更通用的方法,这就是它的变体:

- (NSString *)removeWhitespaces:(NSString *)string {

    NSMutableArray * stringComponents = [[string componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] mutableCopy];
    NSString * fStringComponent = [stringComponents firstObject];
    [stringComponents removeObject:fStringComponent];

    return [fStringComponent stringByAppendingString:[stringComponents componentsJoinedByString:@" "]];
}