NSTime 创建一个时间间隔
我的应用程序的方法 updateLabel2 中有以下代码：
timeLeft = [[NSDate date] timeIntervalSinceDate:[[NSUserDefaults standardUserDefaults] objectForKey:@"lastDate"]];
[[self timer] setText:[NSString stringWithFormat:@"Time Remaining: %f", timeLeft]]; //Set the label text
请注意，计时器是一个标签。
更早之前，执行以下代码：
[[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"lastDate"];
self.repeatTimer = [NSTimer scheduledTimerWithTimeInterval:1
target:self
selector:@selector(updateLabel2)
userInfo:nil
repeats:YES];
我的问题是 timeLeft 被设置为随机整数，这绝对不是 timeIntervals 应该设置的值，并且彼此之间也不在一秒之内。
I have the following code in my application in the method updateLabel2:
timeLeft = [[NSDate date] timeIntervalSinceDate:[[NSUserDefaults standardUserDefaults] objectForKey:@"lastDate"]];
[[self timer] setText:[NSString stringWithFormat:@"Time Remaining: %f", timeLeft]]; //Set the label text
Note that timer is a label.
and earlier, the following code is executed:
[[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"lastDate"];
self.repeatTimer = [NSTimer scheduledTimerWithTimeInterval:1
target:self
selector:@selector(updateLabel2)
userInfo:nil
repeats:YES];
My problem is that timeLeft is being set to random integers which are definetly not what the timeIntervals should be, and are not within one second of each other either.
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您的格式字符串错误：
由于
NSTimeInterval是浮点类型，因此您需要%f而不是%d或timeLeft<调用-[NSString stringWithFormat:]时将 /code> 转换为 int。我认为这就是贾斯汀所指的。
除了
考虑你在那里做什么：
这不应该是“时间已过去”吗？
Your format-string is wrong:
Because
NSTimeIntervalis a floating point type, you need to either%finstead of%dortimeLeftto an int while calling-[NSString stringWithFormat:].Which — I think — is, what Justin referred to.
Aside
Considering what you're doing there:
Shouldn't that be "Time elapsed"?