如何延迟加载? [英] How to lazy load?

问题描述

您如何在tableView:didSelectRowAtIndexPath:中延迟加载NSMutableArray?我对Objective-C，XCode和iOS编程非常陌生，因此不胜感激.

How do you lazy load a NSMutableArray in tableView:didSelectRowAtIndexPath:? I am very new to Objective-C, XCode, and iOS programming, so any help is appreciated.

推荐答案

延迟加载意味着按需加载".因此，仅在确实必要时才执行操作，而不是事先执行.说我们有方法:

Lazy load means 'loading on demand'. So you perform operation only when it is really necessary, and not beforehand. Say we have method:

-(void) init {
   self = [super init];

   mMyMemberArray = [self loadSomeDataToArray];
}

-(void)  tableView:didSelectRowAtIndexPath: {
   [someObject processData: mMyMemberArray];
}

这不是延迟加载，因为我们已经预先加载了数据.但这:

This is not lazy loading cause we've loaded data beforehand. But this:

-(void)  tableView:didSelectRowAtIndexPath: {
   someObject processData: [self loadSomeDataToArray]];
}

完全是延迟加载，导致您在真正需要时获取数据.

is exactly lazy loading, cause you get data when you really need it.

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