Question

如何在info.plist文件中存取数据

Answer 1

这有一个读取plist文件的例子，读取基本上每个项目都有的info.plist文件。这个例子是在一个splash view中显示程序的版本号（对应info.plist中的CFBundleVersion）。
　　NSString *path = [[NSBundle mainBundle] bundlePath];
　　NSString *finalPath = [path stringByAppendingPathComponent: @"Info.plist"];
　　NSDictionary *plistData = [[NSDictionary dictionaryWithContentsOfFile:finalPath] retain];
　　versionLabel = [[UILabel alloc] initWithFrame:CGRectMake(100,100,60,25)];
　　// for example
　　versionLabel.backgroundColor = [UIColor clearColor];
　　versionLabel.textColor = [UIColor whiteColor];
　　versionLabel.font = [UIFont systemFontOfSize:10];
　　NSString *versionString = [NSString stringWithFormat:@"v%@", [plistData objectForKey: @"CFBundleVersion"]];
　　versionLabel.text = versionString;
　　[self.view addSubview:versionLabel];
　　注意上面加粗体的部分，可以看到程序是如何读取dictionary类型的数据，从key得到value的。
　　plist文件是标准的xml文件，在cocoa中可以很简单地使用。这里介绍一下使用方法：以下代码在Mac和iPhone中均适用。
写入plist文件：
NSMutableDictionary* dict = [ [ NSMutableDictionary alloc ]initWithContentsOfFile: @"/Sample.plist" ];

　　[ dict setObject:@"Yes" forKey:@"RestartSpringBoard" ];
　　[ dict writeToFile:@"/Sample.plist" atomically:YES ];

　　读取plist文件：

　　NSMutableDictionary* dict = [ [ NSMutableDictionary alloc ] initWithContentsOfFile: @"/Sample.plist" ];
　　NSString* object = [ dict objectForKey:@"RestartSpringBoard" ];
　　//读plist 文件 到 NSMutableDictionary 中
　　dictplist = [[NSMutableDictionary alloc ] initWithContentsOfURL:[NSURL fileURLWithPath:path]];
　　[dictplist setObject:@"testOne" forKey:@"key1"];
　　NSLog([dictplist objectForKey:@"key1"]);
　　NSArray *array = [[NSArray alloc] initWithObjects: @"item1",@"item2", @"item3",nil];
　　[dictplist setObject:array forKey:@"arrayitemtest"];
　　[dictplist writeToFile:plistPath atomically:YES];
　　NSString *name = [dictplist objectForKey:@"name" ];
　　NSLog(name);
　　arraylist = [[NSMutableArray alloc] initWithArray:[dictplist objectForKey:@"arrayitemtest"]];
　　//从NSMutableDictionary 中构建 plist 文件
　　NSArray *array = [[NSArray alloc] initWithObjects: @"item1",@"item2", @"item3",nil];
　　dictplist = [[NSMutableDictionary alloc ] init];
　　[dictplist setObject:@"nameOne" forKey:@"name"];
　　[dictplist setObject:array forKey:@"item"];
　　[dictplist writeToFile:plistPath atomically:YES];
　　//arraylist = [[NSMutableArray alloc] init];
　　//[arraylist addObject:[dictplist objectForKey:@"name"]];
　　arraylist = [[NSMutableArray alloc] initWithArray:[dictplist objectForKey:@"item"]];