1. iOS開發中使用[[UIApplication sharedApplication] openURL:] 加載其它應用
在iOS開發中,經常需要調用其它App,如撥打電話、發送郵件等。UIApplication:openURL:方法是實現這一目的的最簡單方法,該方法一般通過提供的url參數的模式來調用不同的App。
通過openURL方法可以調用如下應用:
調用瀏覽器(Safari Browser)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http:google.com"]];
調用谷歌地圖(Google Maps)
- NSString *addressText = @"7 Hanover Square, New York, NY 10004";
- addressText = [addressText stringByAddingPercentEscapesUsingEncoding: NSASCIIStringEncoding];
- NSString* urlText = [NSString stringWithFormat:@"http://maps.google.com/maps?q=%@", addressText];
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlText]];
調用郵件客戶端(Apple Mail)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://[email protected]"]];
撥號(Phone Number)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://6463777303"]];
調用短信(SMS)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://466453"]];
調用應用商店(AppStore)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=291586600&mt=8"]];
2. NSUserDefaults讀取和寫入自定義對象
- NSString *string = [NSString stringWithString @"data is here"];
- NSUserDefaults *data = [NSUserDefaults standardUserDefaults];
- [data setObject:string forKey:@"key"];
- NSString *value;
- value = [data objectForKey:"key"];
但是並不是所有的東西都能往裏放的。NSUserDefaults只支持: NSString, NSNumber, NSDate, NSArray, NSDictionary.
3. protocol 和 delegate 回調函數傳值
一、說明
1.協議聲明瞭可以被任何類實現的方法
2.協議不是類,它是定義了一個其他對象可以實現的接口
3.如果在某個類中實現了協議中的某個方法,也就是這個類實現了那個協議。
4.協議經常用來實現委託對象。一個委託對象是一種用來協同或者代表其他對象的特殊對象。
5:委託,就是調用自己定義方法,別的類來實現。
6.新特性說明
@optional預編譯指令:表示可以選擇實現的方法
@required預編譯指令:表示必須強制實現的方法
二、定義
.h
- @protocol ContactCtrlDelegate
- - (void)DismissContactsCtrl;
- - (void)CallBack:(NSString *)str; //回調傳值
- @end
- @interface ContactsCtrl : UIViewController {
- id <ContactCtrlDelegate> delegate;
- }
- @property (nonatomic, assign) id <ContactCtrlDelegate> delegate;
.m
- @synthesize delegate;
三、Demo
二級窗口(子窗口)UIViewController subclass
- 1 Textfield
- 1 Button
1、ContactsCtrl.h
- #import <UIKit/UIKit.h>
- //定義協議
- @protocol ContactCtrlDelegate
- - (void)DismissContactsCtrl; //回調關閉窗口
- - (void)CallBack:(NSString *)str; //回調傳值
- @end
- @interface ContactsCtrl : UIViewController
- {
- __weak IBOutlet UITextField *passData; //textfield
- id <ContactCtrlDelegate> delegate; //開放delegate
- NSString *passedVal; //從主窗口獲取傳值
- }
- @property(nonatomic,retain)id <ContactCtrlDelegate> delegate;
- @property(nonatomic,retain)NSString *passedVal;
- - (IBAction)cancelBtn:(id)sender;
- @end
2、ContactsCtrl.m
- @implementation ContactsCtrl
- @synthesize delegate;
- @synthesize passedVal;
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- // Do any additional setup after loading the view from its nib.
- passData.text = passedVal;
- }
- //調用協議中的方法
- - (IBAction)cancelBtn:(id)sender
- {
- [delegate CallBack:[NSString stringWithFormat:@"%@",passData.text]];
- [delegate DismissContactsCtrl];
- }
一級窗口(父窗口)
- 1 Textfield
- 1 Button
3、ViewController.h
- #import <UIKit/UIKit.h>
- #import "ContactsCtrl.h" //引入二級文件
- @interface ViewController : UIViewController <ContactCtrlDelegate>
- {
- ContactsCtrl *contactsView; //定義
- __weak IBOutlet UITextField *textfield;
- }
- @property(nonatomic,retain) ContactsCtrl *contactsView;
- - (IBAction)addContactsView:(id)sender;
- @end
4、ViewController.m
- #import "ViewController.h"
- @implementation ViewController
- @synthesize contactsView;
- - (IBAction)addContactsView:(id)sender
- {
- ContactsCtrl *contactView = [[ContactsCtrl alloc] initWithNibName:nil bundle:nil];
- self.contactsView = contactView;
- contactsView.delegate = self; //設置委託
- contactsView.passedVal = textfield.text;
- [self presentModalViewController:contactsView animated:YES];
- }
- //實現ContactCtrlDelegate協議中的方法
- - (void)DismissContactsCtrl
- {
- [contactsView dismissModalViewControllerAnimated:YES];
- }
- - (void)CallBack:(NSString *)str
- {
- textfield.text = str;
- }