Question

我在iOS .plist中有一系列字典，结构类似于以下内容：

<plist version="1.0">
<array>
<dict>
    <key>name</key>
    <string>Afghanistan</string>
    <key>government</key>
    <string>Islamic Republic</string>
    <key>population</key>
    <integer>29121286
    </integer>
</dict>
<dict>
    <key>name</key>
    <string>Albania</string>
    <key>government</key>
    <string>Emerging Democracy</string>
    <key>population</key>
    <integer>2986952</integer>
</dict>

我正在尝试将每个字典中的<key>name</key>加载到NSTableViewCell中，然后在NSTableView中按字母顺序显示它们，类似于iOS中的Contacts App。

以下是我的ViewControllers .h和.m。排序正常，但我无法将结果加载到TableViewCells中？

FirstViewController.h

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController  <UITableViewDelegate,UITableViewDataSource>

{   
NSArray *sortedCountries;       
}

@property (nonatomic, retain) NSArray *sortedCountries;

@end

FirstViewController.m

#import "FirstViewController.h"

@implementation FirstViewController

@synthesize sortedCountries;



-(void)viewDidLoad  {

NSString *path = [[NSBundle mainBundle] pathForResource:@"countries"ofType:@"plist"];   
NSArray *countries = [NSArray arrayWithContentsOfFile:path];
NSSortDescriptor *descriptor = [[[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES] autorelease];
NSArray *sortedCountries = [[countries sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]] retain];

}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}

-(NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section {

return 2;   
}

-(UITableViewCell *)tableView:(UITableView *)tableView
        cellForRowAtIndexPath:(NSIndexPath *)indexPath {

NSDictionary *country = [sortedCountries objectAtIndex:indexPath.row];
    NSString *countryName = [country objectForKey:@"name"];

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell =
[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {

    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                   reuseIdentifier:CellIdentifier] autorelease];

}

cell.textLabel.text = countryName;
return cell;        
} 

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;

}


- (void)dealloc {

[sortedCountries release];

[super dealloc];
}

@end

编辑：与此here相关的另一个问题。

Answer 1

将ivar添加到头文件中视图控制器的@interface：

@interface MyViewController : UITableViewController
{
    ...
    NSArray *sortedCountries;
}

将此代码（按国家/地区名称读取和排序）添加到视图控制器的initWith...方法中：

NSArray *countries = [NSArray arrayWithContentsOfFile: pathToPlist];
// Now the array holds NSDictionaries, sort 'em:
NSSortDescriptor *descriptor = [[[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES] autorelease];
sortedCountries = [[countries sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]] retain];

然后使用以下代码段提取值：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSDictionary *country = [sortedCountries objectAtIndex:indexPath.row];
    NSString *countryName = [country objectForKey:@"name"];
    NSString *governmentType = [country objectForKey:@"government"];
    NSSInteger population = [[country objectForKey:@"population"] integerValue];
    // ... do something with countryName, governmentType, population
}

不要忘记发布sortedCountries：

- (void)dealloc
{
    ...
    [sortedCountries release];
    [super dealloc];
}

Answer 2

为您的文件创建NSArray：


NSArray *iOSPlist = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"iOS" ofType:@"plist"]];

然后在这个方法中写if if（cell == nil）{

}：


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
cell.textLabel.text = [[iOSPlist objectAtIndex:indexPath.row] objectForKey:@"name"];
}

并且不要忘记在 - （NSInteger）tableView中返回[iOSPlist count] :( UITableView *）tableView numberOfRowsInSection：（NSInteger）section method;

Answer 3

以下是从info.plist中提取版本号的示例。使用类似的东西来拉出你的名字键（objectForKey：@“name”）

NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:@"Info.plist"];
plist = [[NSDictionary dictionaryWithContentsOfFile:finalPath] retain]; 
NSString* version = [plist objectForKey:@"CFBundleVersion"];

Answer 4

这是关于在plists中处理数据的StackOverflow问题。答案非常详细。

Parse Plist (NSString) into NSDictionary

在UITableView中按字母顺序显示.plist键值

4 个答案: