UILabel 没有收到我写入的内容

发布于 11-25 08:56 字数 544 浏览 2 评论 0原文

写这个主题很棘手。我想这是一个基本问题，但我似乎找不到答案。代码本身显示了我想要执行的操作，而 UILabel 没有显示任何内容，我添加到其中的第一行工作正常，但当我尝试写出数组时则不然：

-(IBAction)getSongHistory:(id)sender {
[historyLabel setText:@"test write\n test write another line"];
NSArray *pastMusicArray = [pastSongs getHistory];
for(int t=2; t<[pastMusicArray count]; t++) {
    NSString *tempRow = [pastMusicArray objectAtIndex:t];
    //NSLog(@"%@", tempRow);
    [historyLabel setText:tempRow];
    [historyLabel setText:@"\n"];
}

}

NSLog 确实输出了正确的内容。这里发生了什么我没有看到的事情？

原文

Tricky to write the subject to this. I guess this is a basic question but I can't seem to find the answer.
The code itself shows what I wanna do and the UILabel don't show anything, the first line I add to it works fine, but not when I try to write out the array:

-(IBAction)getSongHistory:(id)sender {
[historyLabel setText:@"test write\n test write another line"];
NSArray *pastMusicArray = [pastSongs getHistory];
for(int t=2; t<[pastMusicArray count]; t++) {
    NSString *tempRow = [pastMusicArray objectAtIndex:t];
    //NSLog(@"%@", tempRow);
    [historyLabel setText:tempRow];
    [historyLabel setText:@"\n"];
}

}

The NSLog do put out the right stuff.
What is gong on here, that I am not seeing?

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从﹋此江山别2024-12-02 08:56:47

在我看来，问题在于您每次都设置全文，而最后一个 setText: 带有 @"\n" 这是一个不可见的字符串。尝试附加而不是设置文本。类似于：

historyLabel.text = [NSString stringWithFormat:@"%@%@", historyLabel.text,@"TextToAppend"];

这会将@“TextToAppend”附加到标签中的当前文本值。

更新：请注意，我使用的是文本属性而不是设置器。

historyLabel.text = @"Some Text";

相当于

[historyLabel setText:@"Some Text"];

Seems to me that the problem is that you are setting the full text each time and the last setText: is with @"\n" which is an invisible string. Try appending instead of setting the text. Something like:

historyLabel.text = [NSString stringWithFormat:@"%@%@", historyLabel.text,@"TextToAppend"];

This will append @"TextToAppend" to the current text value in the label.

Update: Notice I'm using the text property rather than the setter.

historyLabel.text = @"Some Text";

is equivalent to

[historyLabel setText:@"Some Text"];

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羁客2024-12-02 08:56:47

在字符串中使用 \n 应该没问题，尝试将标签的 numberOfLines 属性设置为 0，这允许其中包含任意数量的行。

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还给你自由2024-12-02 08:56:47

这是我自己的问题的解决方案。希望它可以帮助别人。

NSArray *pastMusicArray = [pastSongs getHistory];
musicHistory = [[NSMutableString alloc] init];
historyLabel.numberOfLines = 0;
for(int t=2; t<[pastMusicArray count]; t++) {
    [musicHistory appendString:[[pastMusicArray objectAtIndex:t] capitalizedString]];
    [musicHistory appendString:@"\n"];
}
historyLabel.text = musicHistory;

This is the solution for my own problem. Hope that it can help someone else.

NSArray *pastMusicArray = [pastSongs getHistory];
musicHistory = [[NSMutableString alloc] init];
historyLabel.numberOfLines = 0;
for(int t=2; t<[pastMusicArray count]; t++) {
    [musicHistory appendString:[[pastMusicArray objectAtIndex:t] capitalizedString]];
    [musicHistory appendString:@"\n"];
}
historyLabel.text = musicHistory;

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