我的目标是将一个字符串添加到数组中,并在我调用的方法中执行此操作.
My goal is to add a string to array, and I do that in a method which I call.
在这个方法中,我在数组中得到一个空值,不知道为什么.我在上课时就有这个:
In this method, I get a null value in the array, and don't know why. I have this at the start of my class:
NSMutableArray *listOfEvents;以及我在每个事件上调用的方法:
and a method which I call on each event:
-(void)EventList { [listOfEvents addObject:@"ran"]; NSLog(@"%@", listOfEvents); }我在日志中得到 (null).
如果我把数组定义NSMutableArray *listOfEvents;放在函数体中,我每次都会得到字符串值@"ran",所以数组总是有只有一个值,而不是有许多名为 @"ran" 的字符串.
If I put the array definition NSMutableArray *listOfEvents; in the function body, I get the string value @"ran", each time, so the array always has only one value, instead of having many strings named @"ran".
这有什么问题吗?好像看不懂数组的东西,看了好几遍文档.
What's wrong with this? It seems that I can't understand something about arrays, even though I have read the documents a number of times.
推荐答案我假设你还没有初始化 listOfEvents.
I'm assuming you haven't initialized listOfEvents.
确保在类的 init 方法中执行 listOfEvents = [[NSMutableArray alloc] init];.还要确保在类的 dealloc 方法中释放它.
Make sure you do listOfEvents = [[NSMutableArray alloc] init]; in your class's init method. Also make sure you release it in your class's dealloc method.
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