在下面的行中我得到内存泄漏

Question

NSDate *today = [[NSDate alloc] init];
    NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *onset = [[NSDateComponents alloc] init];
    [onset setMonth:monthsStart];
    NSDate *fromDate = [gregorian dateByAddingComponents:onset toDate:today options:0];
    [onset setMonth:monthsEnd];
    NSDate *toDate = [gregorian dateByAddingComponents:onset toDate:today options:0];

上面写着：-

1. 方法返回一个具有 +1 保留计数的 Objective-C 对象
2. 对象泄露：分配并存储到today 的对象在此执行路径的后面没有被引用，并且保留计数为+1

Answer 1

泄漏是因为你没有释放today。请使用[today release] 并发布相同的内容。 calender 和 onset 也是如此。在NSDate *toDate = [gregorian dateByAddingComponents:onset toDate:today options:0]; 之后，请立即释放所有这些参数。

NSDate *today = [[NSDate alloc] init];
NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *onset = [[NSDateComponents alloc] init];
[onset setMonth:monthsStart];
NSDate *fromDate = [gregorian dateByAddingComponents:onset toDate:today options:0];
[onset setMonth:monthsEnd];
NSDate *toDate = [gregorian dateByAddingComponents:onset toDate:today options:0];
//After you are done with the below variables, you can release it
[today release];
[calender release];
[onset release]; //you cannot use these variables after this line.

另外请阅读这份文档，Advanced Memory Management Programming Guide