AJ学IOS 之控制器view显示中view的父子关系及controller的父子关系_解决屏幕旋转不能传递事件问题

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AJ分享，必须精品

一：效果

这里写图片描述

二：项目代码

这个Demo用的几个控制器分别画了不通的xib，随便拖拽了几个空间，主要是几个按钮的切换，主要代码展示下：

////  NYViewController.m//  控制器的view的显示////  Created by apple on 14-10-10.//  Copyright (c) 2014年 heima. All rights reserved.//#import "NYViewController.h"#import "NYTestViewController.h"#import "NYOneViewController.h"#import "NYTwoViewController.h"#import "NYThreeViewController.h"@interface NYViewController ()- (IBAction)vc1;- (IBAction)vc2;- (IBAction)vc3;@property (nonatomic, strong) NYTestViewController *test;@property (nonatomic, strong) NYOneViewController *one;@property (nonatomic, strong) NYTwoViewController *two;@property (nonatomic, strong) NYThreeViewController *three;@end@implementation NYViewController- (NYOneViewController *)one{    if (!_one) {        self.one = [[NYOneViewController alloc] init];        self.one.view.frame = CGRectMake(10, 70, 300, 300);    }    return _one;}- (NYTwoViewController *)two{    if (!_two) {        self.two = [[NYTwoViewController alloc] init];        self.two.view.frame = CGRectMake(10, 70, 300, 300);    }    return _two;}- (NYThreeViewController *)three{    if (!_three) {        self.three = [[NYThreeViewController alloc] init];        self.three.view.frame = CGRectMake(10, 70, 300, 300);    }    return _three;}/** * 即将旋转到某个屏幕时调用 */- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{    NSLog(@"NYViewController---willRotateToInterfaceOrientation");}- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{    NSLog(@"NYViewController---didRotateFromInterfaceOrientation");}- (void)viewDidLoad{    [super viewDidLoad];//    NYTestViewController *test = [[NYTestViewController alloc] init];//    test.view.frame = CGRectMake(100, 100, 200, 300);//    test.view.backgroundColor = [UIColor redColor];//    [self.view addSubview:test.view];//    self.test = test;    // 如果发现：控制器的view还在，但是view上面的数据不显示，极大可能是因为：控制器被提前销毁了    // 1.一个控制器的view是可以随意调整尺寸和位置的    // 2.一个控制器的view是可以随意添加到其他view中    // 3.如果将一个控制器的view，添加到其他view中显示，那么要想办法保证控制器不被销毁    // 4.原则：只要view在，view所在的控制器必须得在，这样才能保证view内部的数据和业务逻辑正常}- (IBAction)vc1 {    [self.two.view removeFromSuperview];    [self.three.view removeFromSuperview];    [self.view addSubview:self.one.view];}- (IBAction)vc2 {    [self.one.view removeFromSuperview];    [self.three.view removeFromSuperview];    [self.view addSubview:self.two.view];}- (IBAction)vc3 {    [self.two.view removeFromSuperview];    [self.one.view removeFromSuperview];    [self.view addSubview:self.three.view];}@end

三：旋转事件问题

这样貌似就可以完成大多数的需求了，但是有时候我们会发现一些问题，比如当屏幕旋转的时候事件无法传递

/** * 即将旋转到某个屏幕时调用 */- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{    NSLog(@"NYViewController---willRotateToInterfaceOrientation");}- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{    NSLog(@"NYViewController---didRotateFromInterfaceOrientation");}

如果我们将这两个方法写到one two three这三个控制器中，相应的在屏幕旋转的时候，只有主控制器打印了这个方法，然而其他的控制器中并没有，这里的原因就是他们的控制器是平级的，虽然view是父子关系，解决办法就是设置controller的父子关系。

四：解决代码

当控制器的view互为父子关系，那么控制器最好也互为父子关系

  NYOneViewController *one = [[NYOneViewController alloc]init];

让one控制器成为当前self（HWViewController）的子控制器

    [self addChildViewController:one];

通过关addChildViewController添加一个子控制器，那么这个控制器就会被放到childViewControllers数组中
只要self在，childViewControllers数组就在数组里面的子控制器就在

////  NYViewController.m//  控制器的view的显示////  Created by apple on 14-10-10.//  Copyright (c) 2014年 heima. All rights reserved.//#import "NYViewController.h"#import "NYTestViewController.h"#import "NYOneViewController.h"#import "NYTwoViewController.h"#import "NYThreeViewController.h"@interface NYViewController ()- (IBAction)vc1;- (IBAction)vc2;- (IBAction)vc3;@property (nonatomic, strong) NYTestViewController *test;@end@implementation NYViewController/** * 即将旋转到某个屏幕时调用 */- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{    NSLog(@"NYViewController---willRotateToInterfaceOrientation");}- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{    NSLog(@"NYViewController---didRotateFromInterfaceOrientation");}- (void)viewDidLoad{    [super viewDidLoad];    //当控制器的view互为父子关系，那么控制器最好也互为父子关系    NYOneViewController *one = [[NYOneViewController alloc]init];    //让one控制器成为当前self（HWViewController）的子控制器    [self addChildViewController:one];    //通过关addChildViewController添加一个子控制器，那么这个控制器就会被放到childViewControllers数组中    //只要self在，childViewControllers数组就在数组里面的子控制器就在    NYTwoViewController *two = [[NYTwoViewController alloc]init];    [self addChildViewController:two];    NYThreeViewController *three = [[NYThreeViewController alloc]init];    [self addChildViewController:three];}- (IBAction)vc1 {    NYOneViewController *one = self.childViewControllers[0];    NYTwoViewController *two = self.childViewControllers[1];    NYThreeViewController *three = self.childViewControllers[2];    [two.view removeFromSuperview];    [three.view removeFromSuperview];    [self.view addSubview:one.view];}- (IBAction)vc2 {    NYOneViewController *one = self.childViewControllers[0];    NYTwoViewController *two = self.childViewControllers[1];    NYThreeViewController *three = self.childViewControllers[2];    [one.view removeFromSuperview];    [three.view removeFromSuperview];    [self.view addSubview:two.view];}- (IBAction)vc3 {    NYOneViewController *one = self.childViewControllers[0];    NYTwoViewController *two = self.childViewControllers[1];    NYThreeViewController *three = self.childViewControllers[2];    [two.view removeFromSuperview];    [one.view removeFromSuperview];    [self.view addSubview:three.view];}@end

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