ios - NSUserDefaults 不递增

Question

我正在尝试使用 NSUserDefaults 增加 NSInteger，如下所示:

NSInteger attempts = [[NSUserDefaults standardUserDefaults]integerForKey:@"tries"];
NSInteger newA = attempts++;
[[NSUserDefaults standardUserDefaults]setInteger:newA forKey:@"tries"];
[[NSUserDefaults standardUserDefaults]synchronize];
NSLog(@"Tries: %d",[[NSUserDefaults standardUserDefaults]integerForKey:@"tries"]);

但是这是我的 NSLogs:

Tries: 0
Tries: 0
Tries: 0

Answer 1

这是你的问题

NSInteger newA = attempts++;

将其设置为 newA 后，您正在增加尝试次数，请改为尝试:

NSInteger newA = ++attempts;