IOS开发之——Modal原理和常规使用
文章搬运来源:https://blog.csdn.net/Calvin_zhou/article/details/110931665
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一 概述
- 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的形式展示出来
- Modal的默认效果:新控制器从屏幕的最底部往上钻,知道盖住之前的控制器为止
二 Modal的打开及关闭
2.1 Modal形式展示控制器
-(void)presentViewCOntroller:(UIViewCOntroller *)viewCOntrollerToPresent animated:(BOOL)flag completion:(void^)completion
2.2 关闭Modal出来的控制器
self dismissViewControllerAnimated:<#(BOOL)#> completion:<#^(void)completion#>
三 简单示例
3.1 界面关系
- FirstVIewController(第一个页面),有一个按钮,点击跳转到JumpViewController
- JumpViewController(跳转到的页面),有一个返回按钮,点击返回到FirstViewController
3.2 代码
FirstVIewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *btn=[UIButton buttonWithType:UIButtonTypeContactAdd];
btn.center=self.view.center;
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
-(void)btnClick{
//创建控制器对象
JumpViewController *jump=[[JumpViewController alloc]init];
//Modal出一个控制器
//[self presentModalViewController:jump animated:YES];
[self presentViewController:jump animated:YES completion:nil];
}
JumpViewController
- (IBAction)cancel:(UIButton *)sender {
//关闭
[self dismissViewControllerAnimated:YES completion:nil];
}
3.3 效果图
四 通过导航条方式关闭Modal
4.1 界面修改说明
- 去掉JumpViewController中去掉按钮
- 通过导航条做按钮做返回操作
4.2 代码
FirstVIewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *btn=[UIButton buttonWithType:UIButtonTypeContactAdd];
btn.center=self.view.center;
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
-(void)btnClick{
//创建控制器对象
JumpViewController *jump=[[JumpViewController alloc]init];
//Modal出一个控制器
//[self presentModalViewController:jump animated:YES];
UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:jump];
[self presentViewController:nav animated:YES completion:nil];
}
JumpViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(cancel)];
}
- (IBAction)cancel{
//关闭
[self dismissViewControllerAnimated:YES completion:nil];
}