Question

我正在使用NSUserDefaults编写一些首选项，尽管我想以XML格式保存它们（目前它默认保存为二进制）。我见过some examples of saving .plists using NSPropertylistSerialization，但看起来过于复杂。有一种简单的方法可以做到这一点吗？

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

[defaults setObject:[NSNumber numberWithBool:NO] forKey:@"Button One"];
[defaults setObject:[NSNumber numberWithBool:NO] forKey:@"Button Two"];

[[NSUserDefaults standardUserDefaults] synchronize];

Answer 1

使用Xcode接口创建的

.plist是可读但不可写的。如果要对项目Bundle中的文件进行更改，主要是在文档或库中的一个文件夹中进行复制，然后始终必须处理副本或使用代码创建.plist。

创建：

NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,   NSUserDomainMask, YES) objectAtIndex:0];
NSString* plistPath = [documentsPath stringByAppendingPathComponent:@"test.plist"];

NSArray* fruits= [NSArray arrayWithObjects:@"apple", @"orange", @"cherry", nil];
NSArray* vegetables= [NSArray arrayWithObjects:@"cabbage", @"pumpkin", @"leek", nil];

NSDictionary* dictionary= [NSDictionary dictionaryWithObjectsAndKeys:fruits, @"fruits", vegetables, @"vegetables", nil];

[dictionary writeToFile:plistPath  atomically:YES];

阅读和写作：

NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,    NSUserDomainMask, YES) objectAtIndex:0];
NSString* plistPath = [documentsPath stringByAppendingPathComponent:@"test.plist"];

NSDictionary* dictionary= [[NSDictionary alloc] plistPath ];

NSMutableArray* fruits= [dictionary objectForKey:@"fruits"];
NSMutableArray* vegetables= [dictionary objectForKey:@"vegetables"];

NSLog(@"First Fruit: %@",[fruits objectAtIndex:0]);
NSLog(@"First Vegetable: %@",[vegetables objectAtIndex:0]);

[fruits replaceObjectAtIndex:0 withObject:@"banana"];

[dictionary writeToFile:plistYolu atomically:YES];

NSUserDefaults和NSPropertyListSerialization

1 个答案: