添加和跟踪无限数量的对象的最佳方法是什么？
我有一个按钮，点击该按钮后，会在视图内添加标签。此后无论何时点击它，它都会添加另一个标签，该标签从上一个标签结束的位置开始。
我尝试了这个
if (self.currentLabel == nil)
startingPoint = 0;
else
startingPoint = currentLabel.frame.size.width + 5;
// Most recently created label becomes currentLabel
self.currentLabel = [[FormulaLabel alloc] initWithFrame:CGRectMake(startingPoint, 10, 100, 50)];
为了跟踪所有标签，我尝试将它们添加到数组中，
[arrayOfObjects addObject:self.currentLabel]
但我注意到数组计数没有改变。
为什么上面的代码不起作用，有没有更好的方法来跟踪无限数量的标签？
I have a button that, when tapped, adds a label inside a view. Anytime it is tapped after that, it adds another label that starts where the last one ended.
I tried this
if (self.currentLabel == nil)
startingPoint = 0;
else
startingPoint = currentLabel.frame.size.width + 5;
// Most recently created label becomes currentLabel
self.currentLabel = [[FormulaLabel alloc] initWithFrame:CGRectMake(startingPoint, 10, 100, 50)];
To keep track of all the labels, I tried adding them to an array
[arrayOfObjects addObject:self.currentLabel]
but I noticed that the array count wasn't changing.
Why doesn't the above code work, and is there a better way to keep track of an indefinite amount of labels?
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NSArray 是不可变的。您需要使用 NSMutableArray 。
如果您已经在使用 NSMutableArray，您会收到任何警告吗？
作为补充说明，“arrayOfObjects”是一个糟糕的名字。像“标签”、“usedLabels”或“labelHistory”之类的东西会更具描述性。
NSArrays are immutable. You need to use an NSMutableArray.
If you are already using a NSMutableArray, are you getting any warnings?
As an additional note, "arrayOfObjects" is a poor name. Something like "labels," "usedLabels" or "labelHistory" would be far more descriptive.