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iOS开发UI篇—Modal简单介绍

iOS开发UI篇—Modal简单介绍

一、简单介绍

除了push之外,还有另外一种控制器的切换方式,那就是Modal

任何控制器都能通过Modal的形式展?出来

Modal的默认效果:新控制器从屏幕的最底部往上钻,直到盖住之前的控制器为?

二、代码说明

新建一个项目,在Application的代理中添加window和控制器。

TXAppDelegate.m文件

 1 #import "TXAppDelegate.h" 2 #import "TXOneViewController.h" 3  4 @implementation TXAppDelegate 5  6 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 7 { 8     self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; 9     10     self.window.rootViewController = [[TXOneViewController alloc] init];11     12     [self.window makeKeyAndVisible];13     return YES;14 }15             

 

打开modal窗口

TXViewController.m文件

 1 #import "TXOneViewController.h" 2 #import "TXTwoViewController.h" 3  4 @interface TXOneViewController () 5 - (IBAction)jump; 6  7 @end 8  9 @implementation TXOneViewController10 11 - (void)viewDidLoad12 {13     [super viewDidLoad];14     // Do any additional setup after loading the view from its nib.15 }16 17 - (IBAction)jump {18     // 展示TXTwoViewController19     TXTwoViewController *two = [[TXTwoViewController alloc] init];20     21     UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:two];22     23     [self presentViewController:nav animated:YES completion:^{24         NSLog(@"展示TXTwoViewController完毕.......");25     }];26 }27 @end

 

移除modal视图

TXtwoViewController.m文件

 1 #import "TXTwoViewController.h" 2  3 @interface TXTwoViewController () 4 - (IBAction)cancel; 5  6 @end 7  8 @implementation TXTwoViewController 9 10 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil11 {12     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];13     if (self) {14         // Custom initialization15     }16     return self;17 }18 19 - (void)viewDidLoad20 {21     [super viewDidLoad];22     23     self.title = @"第2个控制器";24 //    self.navigationItem.title25     self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(cancel)];26 }27 28 - (void)didReceiveMemoryWarning29 {30     [super didReceiveMemoryWarning];31     // Dispose of any resources that can be recreated.32 }33 34 - (IBAction)cancel {35 //    NSLog(@"%@", self.view.window.rootViewController);36 //    NSLog(@"%@", self.view.window.subviews);37     [self dismissViewControllerAnimated:YES completion:^{38         NSLog(@"关闭TXTwoViewController....");39     }];40 //    [self.navigationController dismissViewControllerAnimated:YES completion:^{41 //        NSLog(@"关闭TXTwoViewController....");42 //    }];43 }44 @end

 

三、注意点

(1)modal的特点:当modal窗口弹出(从下往上)的时候,后面的视图不可点 
(2)弹出控制器的视图(通过这种方式只能弹出一个视图)
1    //创建一个新的modal并弹出2    TXtwoViewController *two=[[TXtwoViewController alloc]init];3     //在two上用导航控制器包装,让弹出的模态窗口有一个导航栏可以放返回按钮4     UINavigationController *nvc=[[UINavigationController alloc]initWithRootViewController:two5                                  ];6     [self presentViewController:nvc animated:YES completion:^{7         NSLog(@"弹出一个模态窗口");8     }];

 

(3)移除控制器的视图(两种方式都可以)
 1  //编写点击返回按钮的点击事件 2     //点击返回按钮,移除当前模态窗口 3 //    [self.navigationController dismissViewControllerAnimated:YES completion:^{ 4 //        NSLog(@"移除模态窗口"); 5 //    }]; 6      7 // 如果一个控制器是以模态的形式展现出来的, 可以调用该控制器以及该控制器的子控制器让让控制器消失 8     [self dismissViewControllerAnimated:YES completion:^{ 9         NSLog(@"移除");10     }];

 

(4)提示在实际的开发中,如果控制器之间的关系紧密一般用导航控制器,如果控制器之间的关系不是很紧密就用modal
 
四、内部机制
(1)弹出之后,window上面只有一个子视图。
(2)虽然当前界面上展示在我们眼前的时twoview,但是window的根控制器仍然是NJviewController,它并没有切换window的根控制器,而仅仅只是换了window上面显示的视图。
(3)移除的视图并没有销毁,因为控制器并没有销毁,所以控制器对应的view也没有销毁。
(4)在模态弹出(完全显示后),在方法中传入two作为参数,默认就有一个控制器强引用着它。
(5)当向下移除之后,只要调用了控制器的dismiss方法让窗口关闭,modal就释放了。
(6)通常弹出的模态窗口都会提供一个导航条,让界面拥有导航条的最快的方式是给它包装一个导航控制器。
(7)如果一个控制器是以模态的形式展现出来的。可以调用该控制器以及该控制器的子控制器,让该控制器消失。
 

五、数据的传递

项目文件结构和storyboard

代码示例:

TXViewController.m文件

 1 #import "TXViewController.h" 2 #import "TXTwoViewController.h" 3  4 @interface TXViewController () 5  6 @end 7  8 @implementation TXViewController 9 10 - (void)viewDidLoad11 {12     [super viewDidLoad];13     // Do any additional setup after loading the view, typically from a nib.14 }15 /*16    如果控制器之间的关系比较紧密一般用 UINavigationController17    如果控制器之间的关系不是很紧密可以用Modal18 */19 - (void)didReceiveMemoryWarning20 {21     [super didReceiveMemoryWarning];22     // Dispose of any resources that can be recreated.23 }24 //通过segue跳转前,会调用这个方法,在这个方法中把数据传递给弹出来的模态窗口25 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender26 {27     UINavigationController *nav = segue.destinationViewController;28     29     TXTwoViewController *two = (TXTwoViewController *)nav.topViewController;30     31     two.name = @"小说哥";32     33 }34 35 @end

 

TXtwoViewController.h文件

1 #import <UIKit/UIKit.h>2 3 @interface TXTwoViewController : UIViewController4 @property (nonatomic, copy) NSString *name;5 @end

 

TXtwoViewController.m文件

#import "TXTwoViewController.h"@interface TXTwoViewController ()- (IBAction)cancel:(id)sender;@end@implementation TXTwoViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.        NSLog(@"%@", self.name);}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/- (IBAction)cancel:(id)sender {    [self dismissViewControllerAnimated:YES completion:nil];}@end

 

iOS开发UI篇—Modal简单介绍