NSUserDefaults的不遞增

Question

我試圖用NSUserDefaults這樣來增加NSInteger：

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"]); 

但是這是我的NSLogs：

Tries: 0 
Tries: 0 
Tries: 0 

Answer 1

這是你的問題

NSInteger newA = attempts++; 

你在將它設置爲newA之後嘗試增加嘗試次數，請嘗試此嘗試廣告：

NSInteger newA = ++attempts;