iOS中plist的创建，数据写入与读取 !

功能创建一个test.plist文件，textInput作为输入，displayLabel作为显示，有一个按钮来触发保持程序triggerStorage；

-(void)triggerStorage

{

displayLabel.text = textInput.text;

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString *path=[paths    objectAtIndex:0];

NSString *filename=[path stringByAppendingPathComponent:@"test.plist"];   //获取路径

NSDictionary* dic2 = [NSDictionary dictionaryWithContentsOfFile:filename];  //读取数据

NSLog(@"dic2 is:%@",dic2);

//创建一个dic，写到plist文件里

NSDictionary* dic = [NSDictionary dictionaryWithObjectsAndKeys:displayLabel.text,@"IP",nil]; //写入数据

[dic writeToFile:filename atomically:YES];

}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.

- (void)viewDidLoad

{

NSMutableArray *resultData;

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString *path=[paths objectAtIndex:0];

NSLog(@"path = %@",path);

NSString *filename=[path stringByAppendingPathComponent:@"test.plist"];

//读文件

NSDictionary* dic2 = [NSDictionary dictionaryWithContentsOfFile:filename];

NSLog(@"dic is:%@",dic2);

if(dic2 == nil)

{

//1. 创建一个plist文件

NSFileManager* fm = [NSFileManager defaultManager];

[fm createFileAtPath:filename contents:nil attributes:nil];

}

else

{

resultData=[dic2 objectForKey:@"IP"];

if([dic2 count] > 0)

{

displayLabel.text = resultData;

}

else

{

displayLabel.text = @" ";

}

}

self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc]   //按钮的初始化及触发条件设置

initWithTitle:@"保存"

style:UIBarButtonItemStylePlain

target:self

action:@selector(triggerStorage)] autorelease];

[super viewDidLoad];

}