XCode：检查分割字符串值并将其分配给文本字段

发布于 2024-12-07 13:29:36 字数 861 浏览 1 评论 0原文

所以我一直在尝试对此进行测试；基本上我有一个名为 rawData.txt 的文本文件，它看起来像这样：

    060315512 Name Lastname
    050273616 Name LastName

我想分割行，然后分割每一行并检查第一部分（有 9 位数字），但它似乎根本不起作用（我的窗口关闭）这段代码有什么问题吗？

    NSString *path = [[NSBundle mainBundle] pathForResource: @"rawData" ofType:@"txt"];
    if (path)
    {
        NSString *textFile = [NSString stringWithContentsOfFile:path]; 
        NSArray *lines = [textFile componentsSeparatedByString:(@"\n")];
        NSArray *line;
        int i = 0;
        while (i < [lines count])
        {
            line = [[lines objectAtIndex:i] componentsSeparatedByString:(@" ")];
            if ([[line objectAtIndex:0] stringValue] == @"060315512")
            {
                idText.text = [[line objectAtIndex: 0] stringValue];    
            }
            i++;
        }
    }

原文

So i have been trying to test this out; basically i have a text file included named rawData.txt, it looks like this:

    060315512 Name Lastname
    050273616 Name LastName

i wanted to split the lines and then split each individual line and check the first part (with 9 digits) but it seems to not work at all (my window closes) is there any problem with this code?

    NSString *path = [[NSBundle mainBundle] pathForResource: @"rawData" ofType:@"txt"];
    if (path)
    {
        NSString *textFile = [NSString stringWithContentsOfFile:path]; 
        NSArray *lines = [textFile componentsSeparatedByString:(@"\n")];
        NSArray *line;
        int i = 0;
        while (i < [lines count])
        {
            line = [[lines objectAtIndex:i] componentsSeparatedByString:(@" ")];
            if ([[line objectAtIndex:0] stringValue] == @"060315512")
            {
                idText.text = [[line objectAtIndex: 0] stringValue];    
            }
            i++;
        }
    }

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香草可樂 2024-12-14 13:29:36

是的，如果你想比较 2 个字符串，你应该使用 isEqualToString，因为 == 比较变量的指针值。所以这是错误的：

if ([[line objectAtIndex:0] stringValue] == @"060315512")

你应该写：

if ([[[line objectAtIndex:0] stringValue] isEqualToString: @"060315512"])

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百变从容 2024-12-14 13:29:36

如果您检查控制台日志，您可能会看到类似“stringValue 发送到确实响应的对象（NSString）”（或那些效果）的内容。 line 是一个字符串数组，因此 [[line objectAtIndex:0] stringValue] 正在尝试调用 -[NSString stringValue] ，但它不会存在。

你的意思更像是这样的：

NSString *path = [[NSBundle mainBundle] pathForResource: @"rawData" ofType:@"txt"];
if (path)
{
    NSString *textFile = [NSString stringWithContentsOfFile:path]; 
    NSArray *lines = [textFile componentsSeparatedByString:@"\n"];
    for (NSString *line in lines)
    {
        NSArray *columns = [line componentsSeparatedByString:@" "];
        if ([[columns objectAtIndex:0] isEqualToString:@"060315512"])
        {
            idText.text = [columns objectAtIndex:0];
        }
    }
}

If you check your console log, you probably see something like "stringValue sent to object (NSString) that does respond" (or those effects). line is an array of strings, so [[line objectAtIndex:0] stringValue] is trying to call -[NSString stringValue] which does not exist.

You mean something more like this:

NSString *path = [[NSBundle mainBundle] pathForResource: @"rawData" ofType:@"txt"];
if (path)
{
    NSString *textFile = [NSString stringWithContentsOfFile:path]; 
    NSArray *lines = [textFile componentsSeparatedByString:@"\n"];
    for (NSString *line in lines)
    {
        NSArray *columns = [line componentsSeparatedByString:@" "];
        if ([[columns objectAtIndex:0] isEqualToString:@"060315512"])
        {
            idText.text = [columns objectAtIndex:0];
        }
    }
}

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