IOS growth path-interface switching and Data Transmission

Logical process: ViewController. xib is the first interface, which displays the name, price, and summary attributes of Movie object storage.

-(Void) viewDidLoad: This method assigns values to the three attributes and displays them on the page. When you click the Edit button on the page, it calls

-(IBAction) Edit :( id) sender; the method is switched to the EditViewController. xib interface, and the value of name, price, and summary in the first interface is also passed to this interface,

Call the-(void) viewDidLoad method in the EditViewController class to assign values to the Movie object in this class and display it in the TextField control.

-(BOOL) textFieldShouldReturn :( UITextField *) textField;

-(Void) textFieldDidEndEditing :( UITextField *) textField;

These two methods modify the three property values and re-pay the modified value to the Movie object. Then, click the Back button to call

-(IBAction) Back :( id) The sender method returns the previous interface, and

-(Void) viewWillAppear :( BOOL) animated
Method to display the modified value in the second interface in the first interface.

 

First interface:

/* ViewController. h */# import <UIKit/UIKit. h> @ class Movie; @ interface ViewController: UIViewController {// create the Movie object Movie * movie; // define three labels UILabel * titleLabel; UILabel * priceLabel; UILabel * summaryLabel ;} @ property (nonatomic, retain) Movie * movie; @ property (nonatomic, retain) IBOutlet UILabel * titleLabel; @ property (nonatomic, retain) IBOutlet UILabel * priceLabel; @ property (nonatomic, retain) IBOutlet UILabel * summaryLabel; // defines the method for switching the interface-(IBAction) Edit :( id) sender; @ end

 

/* Viewcontroller. M */# import "viewcontroller. H "# import" movie. H "# import" editviewcontroller. H "@ implementation viewcontroller @ synthesize movie; @ synthesize titlelabel; @ synthesize pricelabel; @ synthesize summarylabel;-(void) handle {[Super variable]; // release any cached data, images, etc that aren't in use .} # pragma mark-view lifecycle // initialization when the view is created, only one-(void) vie is called Wdidload {[Super viewdidload]; // initialize the created movie object to name Price summary movie = [[Movie alloc] initwithname: @ "Iron Man" andprice: [nsnumber numberwithint: 122] andsummary: @ "the movie is good"]; // Add the name to the label titlelabel. TEXT = movie. name; // price is of the nsnumber type. It is converted to the int type and added to the pricelabel in the form of a string. Int TMP = [movie. price intvalue]; pricelabel. TEXT = [nsstring stringwithformat: @ "% d", TMP]; // Add the summary to the summarylabel Su Mmarylabel. TEXT = movie. summary; // The above assignment process can be written as // self. movie = movie;} // this method is called every time you enter the view to grant the modified value to label-(void) viewwillappear :( bool) animated {nslog (@ "% @", movie); titlelabel. TEXT = movie. name; int TMP = [movie. price intvalue]; pricelabel. TEXT = [nsstring stringwithformat: @ "% d", TMP]; summarylabel. TEXT = movie. summary; [Super viewwillappear: animated];}-(void) viewdidunload {[Super viewdidunload]; self. Titlelabel = nil; self. pricelabel = nil; self. summarylabel = nil; // release any retained subviews of the main view. // e.g. self. myoutlet = nil;}-(void) viewdidappear :( bool) animated {[Super viewdidappear: animated];} (void) viewwilldisappear :( bool) animated {[Super viewwilldisappear: animated];}-(void) viewdiddisappear :( bool) animated {[Super viewdiddisappear: animated];}-(bool) shouldautorotatetointer Faceorientation :( uiinterfaceorientation) interfaceorientation {// return YES For supported orientations return (interfaceorientation! = Uiinterfaceorientationportraitupsidedown);} // implement the interface switch and pass the value to the past-(ibaction) EDIT :( ID) sender {// The editviewcontroller * tmpedit = [[editviewcontroller alloc] initwithnibname: @ "editviewcontroller" Bundle: Nil] interface for converting from this class interface to the editviewcontroller class; //-(void) presentmodalviewcontroller :( uiviewcontroller *) modalviewcontroller animated :( bool) animated; // print the nslog (@ "% @", movie) in the movie object ); // assign the value (name Price summary) in movie to editmovie tmpedit in the editviewcontroller class. editmovie = movie; // sets the page flip result tmpedit. modaltransitionstyle = custom;/* Other page turning effects: uimodaltransitionstylecoververtical neural coloring algorithm */[self presentmodalviewcontroller: tmpedit animated: Yes]; // implement page switching [tmpedit autorelease]; nslog (@ "Edit function called");} @ end

Interface display:

 

 

Second Interface:

/* Editviewcontroller. H */# import <uikit/uikit. h> @ Class movie; @ interface editviewcontroller: uiviewcontroller {Movie * editmovie; // movie object // three textfield objects uitextfield * textname; uitextfield * textprice; uitextfield * textsummary ;} @ property (nonatomic, retain) iboutlet uitextfield * textname; @ property (nonatomic, retain) iboutlet uitextfield * textprice; @ property (nonatomic, retain) iboutlet uitextfield * textsummary; @ property (nonatomic, retain) Movie * editmovie;-(ibaction) Back :( ID) sender; // defines the method returned to the previous interface @ end

 

/* EditViewController. m */# import "EditViewController. h "# import" Movie. h "@ implementation EditViewController @ synthesize editMovie; @ synthesize textName; @ synthesize textPrice; @ synthesize textSummary;-(id) initWithNibName :( NSString *) bundle :( NSBundle *) nibBundleOrNil {self = [super initWithNibName: nibNameOrNil bundle: nibBundleOrNil]; if (self) {// Custom initialization} return self;}-(void) didReceiveMemoryWarning {// Releases the view if it doesn' t have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use .} # pragma mark-View lifecycle/* // Implement loadView to create a view hierarchy programmatically, without using a nib. -(void) loadView {} * // Add the value obtained from the ViewController class to three texts on the Interface-(void) viewDidLoad {NSLog (@ "editMovie = % @", editMovie); textName. text = editMovie. name; // convert the NSNumber type value to the int type value int tmp = [editMovie. price intValue]; textPrice. text = [NSString stringWithFormat: @ "% d", tmp]; textSummary. text = editMovie. summary; [super viewDidLoad];}-(void) viewDidUnload {self. textName = nil; self. textPrice = nil; self. textSummary = nil; [super viewDidUnload];}-(BOOL) returns :( UIInterfaceOrientation) interfaceOrientation {return (interfaceOrientation = UIInterfaceOrientationPortrait);} // returns the previous interface (IBAction) back :( id) sender {//-(void) dismissModalViewControllerAnimated :( BOOL) animated; method [self dismissModalViewControllerAnimated: YES]; NSLog (@ "Back function called ");} -(void) dealloc {[textName release]; [textPrice release]; [textSummary release]; [editMovie release]; [super dealloc];} // Add a label to return the value every time it is modified # pragma mark UITextFiledDelegate methods-(BOOL) textFieldShouldReturn :( UITextField *) textField {[textField resignFirstResponder]; return YES;} // modify the value in the second interface, and then assign the modified value to the Movie object for storage. When switching to the previous interface, use the object output-(void) textFieldDidEndEditing :( UITextField *) textField {// judgment statement to distinguish name price summary if (textName = textField) {editMovie. name = textField. text;} else if (textPrice = textField) {// The Conversion Type value is int tmp = [textField. text intValue]; // NSString-(int) intValue editMovie. price = [NSNumber numberWithInt: tmp];} else if (textSummary = textField) {editMovie. summary = textField. text;} // print NSLog (@ "% @", editMovie);} @ end

Interface display:

: