模態視圖（IOS開發）
來源：程序員人生 發布時間：2014-11-17 08:53:10 閱讀次數：3281次
模態：模態視圖從屏幕下方滑出來，完成的時候需要關閉這個模態視圖，如果不關閉，就不能做別的事情，必須有響應處理的含義。
主視圖控制器－－－》模態視圖控制器。主視圖控制器與模態視圖控制器之間為父子關系。
UIViewController類中，主要有以下兩個方法：
presentViewController:animated:completion 顯現模態視圖
dismissViewControllerAnimated:completion 關閉模態視圖
代碼：
ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
- (IBAction)regonclick:(id)sender;
@end
ViewController.m
#import "ViewController.h"
#import "RegisterViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 如果要傳遞參數的時候，應當用拜托設計模式或廣播通知機制
// 這里為廣播通知機制
// 注冊1個自定義通知RegisterCompletionNotification，通知到來時候發出registerCompletion:消息，其參數notification中可以包括回傳的參數,統1放在NSDictionary字典中
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(registerCompletion:) name:@"RegisterCompletionNotification" object:nil];
}
- (void)registerCompletion:(NSNotification *)notification
{
// 獲得參數userInfo,是1個字典
NSDictionary *theData = [notification userInfo];
// 獲得字典的username索引值
NSString *username = [theData objectForKey:@"username"];
NSLog(@"username = %@", username);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)regonclick:(id)sender {
// 使用registerViewController的ID獲得視圖控制器對象
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *registerViewController = [mainStoryboard instantiateViewControllerWithIdentifier:@"registerViewController"];
// 設定模態視圖顯現和關閉時候的動畫效果
// 垂直方向由底向上退出
registerViewController.modalPresentationStyle = UIModalTransitionStyleCoverVertical;
// 顯現完成時調用completion代碼塊
// 代碼塊問題回頭再說
[self presentViewController:registerViewController animated:YES completion:^{
NSLog(@"Present Modal View");
}];
}
@end
ResgisterViewController.h
#import <UIKit/UIKit.h>
@interface RegisterViewController : UIViewController
- (IBAction)done:(id)sender;
@property (weak, nonatomic) IBOutlet UITextField *txtUsername;
@end
ResgisterViewController.m
#import "RegisterViewController.h"
@interface RegisterViewController ()
@end
@implementation RegisterViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (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)done:(id)sender {
// 關閉模態視圖，然后繼續調用代碼塊
[self dismissViewControllerAnimated:YES completion:^{
// 代碼塊
NSLog(@"Modal View done");
// 創建1個以username為索引的字典對象
NSDictionary *dataDict = [NSDictionary dictionaryWithObject:self.txtUsername.text forKey:@"username"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"RegisterCompletionNotification" object:nil
userInfo:dataDict];
}];
}
@end
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