iOS当该装置是水平屏，frame和bounds分别-白红宇

iOS当该装置是水平屏，frame和bounds分别

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发布时间：2019-06-27

本文共 4344 字，大约阅读时间需要 14 分钟。

project那里有两个ViewControllers。间ViewController它是root view controller，红色背景，有一个顶button，点击加载后GreenViewController，。底色是绿色。

首先是ViewController的代码：

#import "ViewController.h"#import "GreenViewController.h"@interface ViewController ()@end@implementation ViewController            - (void)viewDidLoad {    [super viewDidLoad];        self.view.backgroundColor = [UIColor redColor];    self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;        UIButton *showGreenViewBtn = [UIButton buttonWithType:UIButtonTypeCustom];    [showGreenViewBtn setTitle:@"Show Green" forState:UIControlStateNormal];    showGreenViewBtn.frame = CGRectMake(0, 0, 100, 44);    showGreenViewBtn.center = self.view.center;    showGreenViewBtn.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;    [showGreenViewBtn addTarget:self action:@selector(showGreenView:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:showGreenViewBtn];}- (void)showGreenView:(id)sender {    GreenViewController *greenVC = [GreenViewController new];    [greenVC show];}@end

然后是GreenViewController的代码：

#import "GreenViewController.h"#import "AppDelegate.h"@interface GreenViewController ()@end@implementation GreenViewController- (void)viewDidLoad {    [super viewDidLoad];        self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;    self.view.backgroundColor = [UIColor greenColor];}- (void)show {    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];    UIViewController *rootViewController = appDelegate.window.rootViewController;    [rootViewController addChildViewController:self];    [rootViewController.view addSubview:self.view];        NSLog(@"RootViewController");    NSLog(@"f %@", NSStringFromCGRect(rootViewController.view.frame));    NSLog(@"b %@", NSStringFromCGRect(rootViewController.view.bounds));        NSLog(@"GreenViewController");    NSLog(@"f %@", NSStringFromCGRect(self.view.frame));    NSLog(@"b %@", NSStringFromCGRect(self.view.bounds));        [self didMoveToParentViewController:rootViewController];}@end

假设是模拟器执行，视图的位置全然正常，因此必须真机执行（模拟器坑死人啊）。横放设备，让红色视图旋转。

点击一下show greenbutton，结果例如以下：

各种奇葩。。。

看看控制台的输出：

2014-07-18 10:29:42.754 FrameBoundsRotate[8588:60b] RootViewController2014-07-18 10:29:42.756 FrameBoundsRotate[8588:60b] f {
    {0, 0}, {320, 568}}2014-07-18 10:29:42.757 FrameBoundsRotate[8588:60b] b {
    {0, 0}, {568, 320}}2014-07-18 10:29:42.758 FrameBoundsRotate[8588:60b] GreenViewController2014-07-18 10:29:42.759 FrameBoundsRotate[8588:60b] f {
    {0, 0}, {320, 568}}2014-07-18 10:29:42.760 FrameBoundsRotate[8588:60b] b {
    {0, 0}, {320, 568}}

原来在设备横屏时，RootViewController的视图的frame依旧是(0, 0, 320, 568)，而bounds则变成了(0, 0, 568, 320)。GreenViewController的视图的frame和bounds都没有变化，因为RootViewController的view的frame没有变化，所以GreenViewController的view的autoresizingMask属性不起作用。

为了解决以上横屏后加入视图时出现的位置变形问题，在show方法中加入self.view.frame = rootViewController.view.bounds，例如以下：

- (void)show {    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];    UIViewController *rootViewController = appDelegate.window.rootViewController;    [rootViewController addChildViewController:self];    [rootViewController.view addSubview:self.view];    self.view.frame = rootViewController.view.bounds;        NSLog(@"RootViewController");    NSLog(@"f %@", NSStringFromCGRect(rootViewController.view.frame));    NSLog(@"b %@", NSStringFromCGRect(rootViewController.view.bounds));        NSLog(@"GreenViewController");    NSLog(@"f %@", NSStringFromCGRect(self.view.frame));    NSLog(@"b %@", NSStringFromCGRect(self.view.bounds));        [self didMoveToParentViewController:rootViewController];}

再执行，没问题了：

控制台输出：

2014-07-18 10:32:30.320 FrameBoundsRotate[8593:60b] RootViewController2014-07-18 10:32:30.323 FrameBoundsRotate[8593:60b] f {
    {0, 0}, {320, 568}}2014-07-18 10:32:30.324 FrameBoundsRotate[8593:60b] b {
    {0, 0}, {568, 320}}2014-07-18 10:32:30.325 FrameBoundsRotate[8593:60b] GreenViewController2014-07-18 10:32:30.326 FrameBoundsRotate[8593:60b] f {
    {0, 0}, {568, 320}}2014-07-18 10:32:30.327 FrameBoundsRotate[8593:60b] b {
    {0, 0}, {568, 320}}

总结：

模拟器坑死人。切记真机调试。

Demo地址：

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