在沙盒中创建文件方法

 1 - (void)creatPlistFile{
 2     NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
 3     NSString *path = [array objectAtIndex:0];
// 拼接phoneContact.plist时，有的Xcode不加/也行

 4 plistPath = [path stringByAppendingString:@"/phoneContact.plist"];

 5     NSFileManager *fileManager = [[NSFileManager alloc]init];
 6     if (![fileManager fileExistsAtPath:plistPath]) {
 7       BOOL isOk = [fileManager createFileAtPath:plistPath contents:nil attributes:nil];
 8         if (isOk) {
 9             NSLog(@"创建成功");
10         }
11         else{
12             NSLog(@"创建失败");
13         }
14     }
15 }