objective-c - NSUserDefaults 总是返回 1 而不是正确的整数

Question

我试图将游戏的当前级别存储在 NSUserDefaults 中，但当我尝试将其转换为 int 时它总是返回 1。这是测试代码:

    [[NSUserDefaults standardUserDefaults] setInteger:34 forKey:@"Current Level"];
    NSLog(@"default level raw: %@", [[NSUserDefaults standardUserDefaults] objectForKey:@"Current Level"]);
    self.levelNum = [[[NSUserDefaults standardUserDefaults] objectForKey:@"Current Level"] intValue];
    NSLog(@"default level num: %i", self.levelNum);

输出:

default level raw: 34
default level num: 1

Answer 1

只需确保在 NSUSerDefaults 上调用同步:

NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];

[defaults setInteger:34 forKey:@"Current Level"];
NSLog(@"default level raw: %@", [defaults objectForKey:@"Current Level"]);

[defaults synchronize]; // Call synchronize after set

self.levelNum = [defaults integerForKey:@"Current Level"];
NSLog(@"default level num: %i", self.levelNum);