(5/18) Re-learning STANDFORD_IOS7 Development _ View Controller life Cycle _ Course Notes

Lesson Five:

1, Uitextview

@property (Nonatomic,ReadOnly) Nstextstorage *textstorage;//Note As a read-only property, you cannot change the contents directly, Nstextstorage is a subclass of nsmutableattributestring, so you can change the string property contents (not the string)//For example, adding a property[Self.body.textStorage addattribute:nsforegroundcolorattributename value:sender.backg Roundcolor Range:self.body.selectedRange]; @property (nonatomic, strong) Uifont*font;//for example, adding fontsSelf.body.font =[Uifont Preferredfontfortextstyle:uifonttextstylebody]; Self.headLine.font=[Uifont preferredfontfortextstyle:uifonttextstyleheadline];//text layout function, text mixing and so on@property (ReadOnly) Nstextcontainer *TextContainer; @property (ReadOnly) Nslayoutmanager *layoutmanager;

2. View Controller Lifecycle

-(Instancetype) Initwithnibname: (NSString *) name Bundle: (NSBundle *) bundle;//non-storyboard loading mode, specifying initializer- (void) awakefromnib;//called when the UI is loaded from storyboard, the output port is not set at this time//Setting the output port- (void) Viewdidload;//Controller Initialization code (one-time) can be placed, such as Init. Cannot place geometry-related code when UI boundaries in the controller are not determined//Determine geometry layout//called when the view frame changes, where it is appropriate to add geometry-related code- (void) viewwilllayoutsubviews;- (void) viewdidlayoutsubviews;//other APIs on screen rotation ...- (void) Viewwillappear: (BOOL) animated;//may be called repeatedly in the life cycle, so it is not possible to place one-time initialization content- (void) Viewdidappear: (BOOL) animated;- (void) Viewwilldisappear: (BOOL) animated;//can do some current data saving work- (void) Viewdiddisappear: (BOOL) animated;- (void) didreceivememorywarning;//system is called when memory is low

3, Nsnotification

(This lesson only covers how to listen to notifications)

[Nsnotificationcenter Defaultcenter];//Get Defaultcenter//Add Observer- (void) Addobserver: (ID) Observer//the object that receives the notificationselector: (SEL) methodtoinvokeifsomethinghappens name: (NSString*) name//Broadcast name                    Object:(ID) sender;//listen to the broadcast object, nil refers to listen to all objects//call method after receiving notification- (void) Methodtoinvokeifsomethinghappens: (Nsnotification *) notification{Notification.name//The name passed aboveNotification.Object //send a Broadcast objectNotification.userinfo//notification-specific information about what happened (depending on sender)}//end Listen notification, usually placed when the view disappears from the interface[center removeobserver:self]; [Center removeobserver:self Name:uicontentsizecategorydidchangenotificationObject: nil];

Notification instance (System settings font change)

//The view appears on the screen to register the notification- (void) Viewwillappear: (BOOL) animated{[Super viewwillappear:animated]; [[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (preferredfontchanged:) Name: UicontentsizecategorydidchangenotificationObject: nil];}//Invoke method when notification occurs- (void) preferredfontchanged: (Nsnotification *) notification{[self usepreferredfonts];}//re-set font- (void) usepreferredfonts{Self.body.font=[Uifont Preferredfontfortextstyle:uifonttextstylebody]; Self.headLine.font=[Uifont preferredfontfortextstyle:uifonttextstyleheadline];}//view left interface is removal notification- (void) Viewwilldisappear: (BOOL) animated{[Super viewwilldisappear:animated]; [[Nsnotificationcenter Defaultcenter] removeobserver:self Name:uiconten TsizecategorydidchangenotificationObject: nil];

4. Homework

No

Course Example Attributor Source: https://github.com/NSLogMeng/Stanford_iOS7_Study/commit/242826c2220afe978bc1d060c2dff19578a835c9

Course Video Address: NetEase Open class: Http://open.163.com/movie/2014/1/L/H/M9H7S9F1H_M9H801GLH.html

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(5/18) Re-learning STANDFORD_IOS7 Development _ View Controller life Cycle _ Course Notes