面试

iOS UIViewController的生命周期以及各个方法的

2019-06-13  本文已影响0人  左左4143

注意:iOS6以后viewWillUnload和viewDidUnload方法被废弃

假设App的根控制器为一个NavigationController,NavigationController的根控制器是在storyBoard中关联的ViewController,然后我们用纯代码创建一个AViewController,再用Xib创建一个BViewController,在每个vc内将生命周期涉及到的方法全部重写,运行工程,依次从ViewController Push 到 AViewController,再从AViewController Push 到 BViewController,那么这些方法的执行顺序是:

2019-05-23 21:58:10.832462+0800 ZGQTest[9425:4368906] -[ViewController initWithCoder:]
2019-05-23 21:58:10.832952+0800 ZGQTest[9425:4368906] -[ViewController awakeFromNib]
2019-05-23 21:58:10.856801+0800 ZGQTest[9425:4368906] -[ViewController viewDidLoad]
2019-05-23 21:58:10.857280+0800 ZGQTest[9425:4368906] -[ViewController viewWillAppear:]
2019-05-23 21:58:10.859349+0800 ZGQTest[9425:4368906] -[ViewController viewWillLayoutSubviews]
2019-05-23 21:58:10.859520+0800 ZGQTest[9425:4368906] -[ViewController viewDidLayoutSubviews]
2019-05-23 21:58:10.862093+0800 ZGQTest[9425:4368906] -[ViewController viewDidAppear:]
2019-05-23 21:58:13.498421+0800 ZGQTest[9425:4368906] -[AViewController initWithNibName:bundle:]
2019-05-23 21:58:13.498583+0800 ZGQTest[9425:4368906] -[AViewController init]
2019-05-23 21:58:13.501946+0800 ZGQTest[9425:4368906] -[AViewController viewDidLoad]
2019-05-23 21:58:13.503255+0800 ZGQTest[9425:4368906] -[ViewController viewWillDisappear:]
2019-05-23 21:58:13.503615+0800 ZGQTest[9425:4368906] -[AViewController viewWillAppear:]
2019-05-23 21:58:13.542234+0800 ZGQTest[9425:4368906] -[AViewController viewWillLayoutSubviews]
2019-05-23 21:58:13.542406+0800 ZGQTest[9425:4368906] -[AViewController viewDidLayoutSubviews]
2019-05-23 21:58:14.047871+0800 ZGQTest[9425:4368906] -[ViewController viewDidDisappear:]
2019-05-23 21:58:14.048405+0800 ZGQTest[9425:4368906] -[AViewController viewDidAppear:]
2019-05-23 21:58:14.327848+0800 ZGQTest[9425:4368906] -[BViewController initWithNibName:bundle:]
2019-05-23 21:58:14.327993+0800 ZGQTest[9425:4368906] -[BViewController init]
2019-05-23 21:58:14.343565+0800 ZGQTest[9425:4368906] -[BViewController viewDidLoad]
2019-05-23 21:58:14.343814+0800 ZGQTest[9425:4368906] -[AViewController viewWillDisappear:]
2019-05-23 21:58:14.343938+0800 ZGQTest[9425:4368906] -[BViewController viewWillAppear:]
2019-05-23 21:58:14.373337+0800 ZGQTest[9425:4368906] -[BViewController viewWillLayoutSubviews]
2019-05-23 21:58:14.373683+0800 ZGQTest[9425:4368906] -[BViewController viewDidLayoutSubviews]
2019-05-23 21:58:14.879546+0800 ZGQTest[9425:4368906] -[AViewController viewDidDisappear:]
2019-05-23 21:58:14.879735+0800 ZGQTest[9425:4368906] -[BViewController viewDidAppear:]

再依次pop回去这些方法的执行顺序为:

2019-05-23 21:59:06.568660+0800 ZGQTest[9425:4368906] -[BViewController viewWillDisappear:]
2019-05-23 21:59:06.568848+0800 ZGQTest[9425:4368906] -[AViewController viewWillAppear:]
2019-05-23 21:59:07.074312+0800 ZGQTest[9425:4368906] -[BViewController viewDidDisappear:]
2019-05-23 21:59:07.075610+0800 ZGQTest[9425:4368906] -[AViewController viewDidAppear:]
2019-05-23 21:59:07.077028+0800 ZGQTest[9425:4368906] -[BViewController dealloc]
2019-05-23 21:59:07.267187+0800 ZGQTest[9425:4368906] -[AViewController viewWillDisappear:]
2019-05-23 21:59:07.267346+0800 ZGQTest[9425:4368906] -[ViewController viewWillAppear:]
2019-05-23 21:59:07.770999+0800 ZGQTest[9425:4368906] -[AViewController viewDidDisappear:]
2019-05-23 21:59:07.771174+0800 ZGQTest[9425:4368906] -[ViewController viewDidAppear:]
2019-05-23 21:59:07.771344+0800 ZGQTest[9425:4368906] -[AViewController dealloc]
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