iphone - 如何从 NSNumber 中获取整数

Question

我有这段代码，我保存总秒数并将其加载到结果视图控制器中。在我的结果视图控制器中，我输入了这段代码，

- (void) counting
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSNumber *loadSecond = [defaults objectForKey:@"saveSecond"];
    NSLog(@"last save is %@", loadSecond); // in here, log is displaying 30 seconds
    scratch = fmod(secondCount,3600);
    hour =  secondCount / 3600;
    minute = scratch / 60;
    second = fmod(scratch,60);
    labelRecord.text = [NSString stringWithFormat:@"%d:%d:%d", hour , minute, second];
}

从上面看，NSLog 显示我的最后一次保存计数为 30 秒，这是正确的，但我如何将这 30 秒更改为 secondCount？因为我想在我的 labelRecord 中使用它。

score 3 · Accepted Answer

更改此行

NSNumber *loadSecond = [defaults objectForKey:@"saveSecond"];

到

int loadSecond = [[defaults objectForKey:@"saveSecond"] intValue];

这假定键 saveSecond 的对象是NSNumber.

score 1 · Accepted Answer

使用 intValue 消息

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/nsnumber_Class/Reference/Reference.html#//apple_ref/occ/instm/NSNumber/intValue

score 1 · Accepted Answer

快速浏览一下文档会发现有一个NSUserDefaults返回整数的方法：

NSInteger loadSecond = [defaults integerForKey:@"saveSecond"];

NSInteger is just an int. There's also NSUInteger which is unsigned.

iphone - 如何从 NSNumber 中获取整数

3 回答 3

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