iphone - 将数据从 plist 输出到 NSString

Question

我正在从 plist 中提取一些字符串数据:

<dict>
<key>Feb 7, 2000</key>
<array>
    <string>7</string>
    <string>8</string>
</array>
<key>Jan 27, 2001</key>
<array>
    <string>8</string>
    <string>7</string>
</array>

并使用以下代码在 UILabel 中输出数据:

  NSString * myString = [NSString stringWithFormat:@"%@",self.data];

    myLabel.text = myString;

输出显示为 ( 7, 8)

有谁知道我应该如何去除括号和逗号。并将值分开，这样我就可以显示类似 first: 7 second: 8

的内容

Answer 1

例子:

<dict>
<key>Feb 7, 2000</key>
<array>
    <string>7</string>
    <string>8</string>
</array>
<key>Jan 27, 2001</key>
<array>
    <string>8</string>
    <string>7</string>
</array>
</dict>

代码:

NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithContentsOfFile:path]; 

for(id key in dict) {
    NSLog(@"First:%@ Second:%@", [[dict objectForKey:key] objectAtIndex:0],  [[dict objectForKey:key] objectAtIndex:1]);
}

输出:

First:7 Second:8
First:8 Second:7

编辑 (回复评论)

首先，您需要确定 NSMutableDictionary 中的键。
加载 .plist 文件，遍历并将键添加到 NSMutableArray。

NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithContentsOfFile:path]; 
NSMutableArray *keys = [[NSMutableArray alloc] init];
for(id key in dict) [keys addObject:[NSString stringWithFormat:@"%@",key]];

确保数组可以被 UIPickerView 访问。
UIPickerView 应该能够像这样检索键:

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
    return [keys objectAtIndex:row];
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
{
    return [keys count];
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
    return 1;
}

最后，像这样更新 UILabel:

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    theLabel.text = [NSString stringWithFormat:@"First:%@ Second:%@", 
                      [[dict objectForKey:[keys objectAtIndex:row]] objectAtIndex:0],  
                      [[dict objectForKey:[keys objectAtIndex:row]] objectAtIndex:1]];
}

UIPickerView 现在包含以下行:

Feb 7, 2000
Jan 27, 2001

例如，当选择“2001 年 1 月 27 日”时，UILabel 显示:

First:8 Second:7