xml - NSUserDefaults 和 NSPropertyListSerialization

Question

我正在使用 NSUserDefaults 编写一些首选项，尽管我想将它们保存为 XML 格式(目前默认情况下以二进制格式保存)。我见过some examples of saving .plists using NSPropertylistSerialization ，但是它们看起来过于复杂。有没有简单的方法可以做到这一点？

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 界面创建的

.plist 可读但不可写。如果您想对项目 bundle 中的文件进行更改，主要在要复制的文档或库中的文件夹之一中，那么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];