[WWDC 2011 Summary & Practice] [AppFramwork] Session 100

2011-10-30iOS Dev

What’s New in Cocoa Touch

WWDC 2011的视频真心不错,身为iOS开发者必看,但是光看也记不住什么,就发个博文一方面当做笔记,一方面与懒得看视频的人分享一下其中的部分内容.

虽然很久以前就把Session 100看完了,但还是决定先用这个练练手,内容我尽量覆盖全,并且提供一些我测试的例子,也会贴些图.写过博客的都知道贴图是很繁琐的,所以请原谅的我的懒惰,我真的没有那么充裕的时间去截很多图.

WWDC 2011视频以及 Keynote(PDF格式)下载详见这里http://developer.apple.com/videos/(需要注册个开发者账号,但是不是交$99那种,“野生“开发者即可)

UIStepper

一个新控件,附带很少的属性,和UIButton用法差不多:

UIStepper *stepper = [[UIStepper alloc] initWithFrame:CGRectMake(44, 44, 100, 44)];
[self.view addSubview:stepper];
[stepper addTarget:self action:@selector(stepperTouched:) forControlEvents:UIControlEventTouchUpInside];

- (void)stepperTouched:(id)sender {
NSLog(@"stepper touched");
}

UIAlertView

终于可以在AlerView里输入文字了,真是佩服iOS5之前那些牛人怎么想到AlertView的各种使用技巧的.

typedef enum {
      UIAlertViewStyleDefault = 0,
      UIAlertViewStyleSecureTextInput,
      UIAlertViewStylePlainTextInput,
      UIAlertViewStyleLoginAndPasswordInput
  } UIAlertViewStyle;
@property(nonatomic,assign) UIAlertViewStyle alertViewStyle;
- (UITextField *)textFieldAtIndex:(NSInteger)textFieldIndex

UIScreenOverscanCompensation

跟外接屏幕有关,本人目前为止还没遇到使用这个功能的情景,不多评论

typedef enum {
     UIScreenOverscanCompensationScale,
     UIScreenOverscanCompensationInsetBounds,
     UIScreenOverscanCompensationInsetApplicationFrame
 } UIScreenOverscanCompensation;
 @property(nonatomic) UIScreenOverscanCompensation
 overscanCompensation;

UIScreen

可以像iOS一样调节亮度了,两个新属性:

@property (nonatomic) CGFloat brightness;
@property (nonatomic) BOOL wantsSoftwareDimming;

结合之前的UIStepper使用:

UIStepper *stepper = [[UIStepper alloc] initWithFrame:CGRectMake(44, 44, 100, 44)];
[stepper setMaximumValue:2.0];
[stepper setMinimumValue:-2.0];
[stepper setStepValue:0.1];
[self.view addSubview:stepper];
[stepper addTarget:self action:@selector(stepperTouched:) forControlEvents:UIControlEventTouchUpInside];
[[UIScreen mainScreen] setWantsSoftwareDimming:YES];

- (void)stepperTouched:(id)sender {
    NSLog(@"stepper touched with value %f", [(UIStepper *)sender value]);
    [[UIScreen mainScreen] setBrightness:[(UIStepper *)sender value]];
}

brightness范围在0.0-1.0,wantsSoftwareDimming是使用软件模拟来获得更低的亮度,但是开启会损失性能,本人实测似乎没有效果,或许是方法不对.鉴于不太实用,暂且搁置.

UIScrollView delegate

新增一个delegate:

- (void)scrollViewWillEndDragging:(UIScrollView *)sv
       withVelocity:(CGPoint)velocity
targetContentOffset:(inout CGPoint *)tCO;

velocity是拖动的手指离开屏幕时ScrollView的移动速度,targetContentOffset是scroll停止的位置,通过拦截这个delegate我们就可以设置Scroll操作停止的位置,而不只是任由用户控制.比如下图,我想要在用户Scroll时可以让ScrollView停止在每格的正中间,就可以通过这个Delegate设置

UIScrollViewDelegate

UIReferenceLibraryViewController

可以调用iOS5自带的字典,这个详细的参考文档吧

UITableView(Controller)/UISplitViewController

新增了一些delegate

- (BOOL)splitViewController:(UISplitViewController *)svc
   shouldHideViewController:(UIViewController *)vc
   inOrientation:(UIInterfaceOrientation)orientation;

- (BOOL)tableView:(UITableView *)tv
       shouldShowMenuForRowAtIndexPath:(NSIndexPath *)ip;
 - (BOOL)tableView:(UITableView *)tv
  canPerformAction:(SEL)action
 forRowAtIndexPath:(NSIndexPath *)ip;
 - (void)tableView:(UITableView *)tv
     performAction:(SEL)action
 forRowAtIndexPath:(NSIndexPath *)indexPath;

UITableViewCell可以通过NIB文件重用了

 - (void)registerNib:(UINib *)nib
 forCellReuseIdentifier:(NSString *)identifier;

关于TableView的详细内容还要等到Session 125 UITableView Changes, Tips & Tricks

iPad Keyboard相关

UIWindow keyboard notifications,iPad的屏幕键盘可以移动,可以分成两块,下面两个就是支持这些操作的

NSString *const UIKeyboardWillChangeFrameNotification;
NSString *const UIKeyboardDidChangeFrameNotification;

UIImage

新增两个工厂方法:

+ (UIImage *)animatedImageNamed:(NSString *)name
                       duration:(NSTimeInterval)duration;
+ (UIImage *)animatedImageWithImages:(NSArray *)images
                            duration:(NSTimeInterval)duration;
@property (nonatomic, readonly) NSArray *images;
@property (nonatomic, readonly) NSTimeInterval duration;

可以把多个图片放到一个UIImage里,显示时就可以顺序切换图片,和gif动画效果一样.

此外还有:

-(UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)i;
+(UIImage *)animatedResizableImageNamed:(NSString *)name
            capInsets:(UIEdgeInsets)capInsets
            duration:(NSTimeInterval)duration;

设置一个图片的缩放范围,比如:可以不缩放外围的圆角,而只缩放中间部分,这个详细的看文档吧.

StoryBoard

简单的说就是可以直接在InterfaceBuilder里面添加ViewController之间切换流程,App速成更方便了. 具体内容在Session 309 Introducing Interface Builder Storyboarding

Appearance Proxy(UIAppearance protocol)

可以为某一种控件设置样式,对App中所有相同控件有效

[[UISlider appearance] setMinimumTrackTintColor:[UIColor redColor]];

具体内容在Session 114 Customizing the Appearance of UIKit Controls

UIPageViewController

可以像iBooks那样翻页了,效果和iBooks相同没有任何缩水

Creating

- (id)initWithTransitionStyle:
               (UIPageViewControllerTransitionStyle)style
         navigationOrientation:
(UIPageViewControllerNavigationOrientation)orientation options:(NSDictionary *)options;

 id <UIPageViewControllerDelegate> delegate;
 id <UIPageViewControllerDataSource> dataSource;

UIPageViewControllerDelegate

- (void)pageViewController:(UIPageViewController *)pvc
         didFinishAnimating:(BOOL)finished
    previousViewControllers:(NSArray *)prevViewCs
        transitionCompleted:(BOOL)completed;
- (UIPageViewControllerSpineLocation)
                   pageViewController:(...)pvc
 spineLocationForInterfaceOrientation:(...)o;

UIPageViewControllerDataSource

- (UIViewController *)
          pageViewController:(UIPageViewController *)pvc
 viewControllerBeforeViewController:(UIViewController*)c;
 - (UIViewController *)
          pageViewController:(UIPageViewController *)pvc
 viewControllerAfterViewController:(UIViewController *)c;

UIViewController

开放了一些API方便开发者写自定的Container

-(void)addChildViewController:(UIViewController *)cvc;
-(void)removeFromParentViewController;

@property (readonly) NSArray *childViewControllers;

-(void)transitionFromViewController:(UIViewController *)fVC
    toViewController:(UIViewController *)toViewController
            duration:(NSTimeInterval)duration
             options:(UIViewAnimationOptions)options
          animations:(void (^)(void))animations
          completion:(void (^)(BOOL finished))completion;

具体在Session 102 Implementing UIViewController Containment

UIDocument

文件操作,有很方便的错误处理:

- (id)initWithFileURL:(NSURL *)url;

@property (readonly) NSURL *fileURL;
@property (readonly, copy) NSString *localizedName;
@property (readonly, copy) NSString *fileType; @property (copy) NSDate *fileModificationDate;
@property (retain) NSUndoManager *undoManager;

- (void)openWithCompletionHandler:
                (void (^)(BOOL success))completionHandler;
- (void)closeWithCompletionHandler:
                (void (^)(BOOL success))completionHandler;
- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError **)outError;
- (id)contentsForType:(NSString *)typeName error:(NSError **)outError;

- (void)handleError:(NSError *)error userInteractionPermitted:(BOOL)interactionPermitted;
- (void)finishedHandlingError:(NSError *)error recovered:(BOOL)recovered;
- (void)userInteractionNoLongerPermittedForError:(NSError *)error;

enum {
    UIDocumentStateNormal,
    UIDocumentStateClosed = 1 << 0,
    UIDocumentStateInConflict = 1 << 1,
    UIDocumentStateSavingError = 1 << 2,
    UIDocumentStateEditingDisabled = 1 << 3
};
typedef NSInteger UIDocumentState;

@property (readonly) UIDocumentState documentState; NSString *const UIDocumentStateChangedNotification;

具体在Session 116 Storing Documents in iCloud Using iOS 5

AssetsLibrary

没接触过这部分:

• ALAssetsLibrary

- (void)addAssetsGroupAlbumWithName:(NSString *)name resultBlock:(ALAssetsLibraryGroupResultBlock)r;

• ALAssetsGroup

- (BOOL)addAsset:(ALAsset *)asset;

• Modifying assets

-(void)writeModifiedImageDataToSavedPhotosAlbum:(NSData *)d
                metadata:(NSDictionary *)metadata
        completionBlock:(ALAssetsLibraryWriteImageCompletionBlock)block;
-(void)setImageData:(NSData *)data
           metadata:(NSDictionary *)metadata
    completionBlock:(ALAssetsLibraryWriteImageCompletionBlock)block;

其他更新

GameKit

Session 402 403 Essential Game Technologies for iOS

Core Data

What’s New in Core Data on iOS

NewsstandKit

Building Newsstand Apps

Twitter

Session 124 Twitter Integration

CoreImage

Session 422 Using Core Image on iOS & Mac OS X

GLKit

Session 414 Advances in OpenGL ES for iOS 5

Session 100 只是简短的介绍一下iOS 5的新增内容,视频还是值得一看的,各位开发者不要错过

—以上—

标签：iOS WWDC XCode