【深入浅出IOS开发】创建Model类型Controller

①在Appdelegate.m中实现以下代码：

[objc] view plaincopy

1. - (IBAction)model:(UIButton *)sender{  
2.     MRViewControllerTwo *vcTwo = [[MRViewControllerTwo alloc]initWithNibName:@"MRViewControllerTwo" bundle:nil];  
3.     UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vcTwo];  
4.       
5.     [self presentViewController:nav animated:YES completion:^{  
6.           
7.     }];  
8. }  

②通过xib创建两个Viewcontroller，在One中通过presentViewController进入第二个ViewController中

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1. - (IBAction)model:(UIButton *)sender{  
2.     MRViewControllerTwo *vcTwo = [[MRViewControllerTwo alloc]initWithNibName:@"MRViewControllerTwo" bundle:nil];  
3.     UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vcTwo];  
4.       
5.     [self presentViewController:nav animated:YES completion:^{  
6.           
7.     }];  
8. }  

③在Two中，可以通过dismissViewController进入前一个ViewController中

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1. - (void)viewDidLoad {  
2.     [super viewDidLoad];  
3.     self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(cancel)];  
4.     // Do any additional setup after loading the view from its nib.  
5. }  
6.   
7. - (void)cancel  
8. {  
9.     [self.navigationController dismissViewControllerAnimated:YES completion:^{  
10.           
11.     }];  
12. }