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IOS成长之路-实现界面切换和数据的传递

2014-03-10 14:18 399 查看

逻辑过程：ViewController.xib为第一个界面，里面显示的是Movie对象存储的name，price，summary 三个属性，会通过

- (void)viewDidLoad 这个方法给三个属性赋值并在界面中显示出来，当点击界面的Edit按钮的时候，会调用ViewController类中的

-(IBAction)Edit:(id)sender; 方法切换到EditViewController.xib界面，而且还会把第一个界面中的 name，price，summary 的值传递到这个界面中，

调用EditViewController这个类中的 - (void)viewDidLoad 这个方法为这个类中的Movie对象赋值，并在TextField控件中显示出来，通过这个类中的

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

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

这两个方法实现对三个属性值的修改并把修改后的值重新付给了Movie对象，然后点击Back按钮调用

-(IBAction)Back:(id)sender 方法返回上一个界面，然后还会通过当前界面（也就是第一个界面）的类中的

- (void)viewWillAppear:(BOOL)animated
方法，实现把在第二个界面中修改后的值显示在第一个界面中。

第一个界面：

[cpp] view
plaincopy

/*ViewController.h*/

#import <UIKit/UIKit.h>

@class Movie;

@interface ViewController : UIViewController

{

//创建Movie对象

Movie *movie;

//定义三个Label

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;

//定义切换界面的方法

-(IBAction)Edit:(id)sender;

@end

[cpp] view
plaincopy

/*ViewController.m*/

#import "ViewController.h"

#import "Movie.h"

#import "EditViewController.h"

@implementation ViewController

@synthesize movie;

@synthesize titleLabel;

@synthesize priceLabel;

@synthesize summaryLabel;

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.

}

#pragma mark - View lifecycle

//view 被创建的时候初始化，只会调用一次

- (void)viewDidLoad

{

[super viewDidLoad];

//初始化创建的Movie对象给name price summary

movie = [[Movie alloc]initWithName:@"Iron man" andPrice:[NSNumber numberWithInt:122] andSummary:@"the movie is good"];

//把name添到Label中

titleLabel.text = movie.name;

//price是NSNumber类型，转换成int型并一字符串的形式添到priceLabel中

int tmp = [movie.price intValue];

priceLabel.text = [NSString stringWithFormat:@"%d",tmp];

//把summary添到summaryLabel中

summaryLabel.text = movie.summary;

//上面赋值的过程可以写为

//self.movie = movie;

}

//每次进入view都会调用该方法实现把修改后的值赋给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)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

// Return YES for supported orientations

return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

//实现界面的切换并把值传递过去

-(IBAction)Edit:(id)sender

{

//要从此类界面转换到EditViewController类的界面

EditViewController *tmpEdit = [[EditViewController alloc]initWithNibName:@"EditViewController" bundle:nil];

//- (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated;

//打印movie对象里面的值

NSLog(@"%@",movie);

//把movie里面的值（name price summary）赋给 EditViewController 类里面的movie对象editMovie

tmpEdit.editMovie = movie;

//设置翻页效果

tmpEdit.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

/*

其他翻页效果：

UIModalTransitionStyleCoverVertical

UIModalTransitionStyleFlipHorizontal

UIModalTransitionStyleCrossDissolve

UIModalTransitionStylePartialCurl

*/

[self presentModalViewController:tmpEdit animated:YES];//实现页面的切换

[tmpEdit autorelease];

NSLog(@"Edit function called");

}

@end

界面显示：

第二个界面：

[cpp] view
plaincopy

/*EditViewController.h*/

#import <UIKit/UIKit.h>

@class Movie;

@interface EditViewController : UIViewController

{

Movie *editMovie;//movie对象

//三个textField对象

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;//定义返回到上一个界面的方法

@end

[cpp] view
plaincopy

/*EditViewController.m*/

#import "EditViewController.h"

#import "Movie.h"

@implementation EditViewController

@synthesize editMovie;

@synthesize textName;

@synthesize textPrice;

@synthesize textSummary;

- (id)initWithNibName:(NSString *)nibNameOrNil 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

{

}

*/

//把从ViewController类中得到的值添加到界面中三个text中

- (void)viewDidLoad

{

NSLog(@"editMovie = %@",editMovie);

textName.text = editMovie.name;

//把NSNumber类型的值转换成int型的值

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)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

//返回上一个界面

-(IBAction)Back:(id)sender

{

//- (void)dismissModalViewControllerAnimated:(BOOL)animated; 方法

[self dismissModalViewControllerAnimated:YES];

NSLog(@"Back function called");

}

-(void)dealloc

{

[textName release];

[textPrice release];

[textSummary release];

[editMovie release];

[super dealloc];

}

//加一个标签作用是实现把值每修改一次则返回一次

#pragma mark UITextFiledDelegate methods

-(BOOL)textFieldShouldReturn:(UITextField *)textField

{

[textField resignFirstResponder];

return YES;

}

//实现在第二个界面中修改值，然后把修改后的值赋给Movie对象存储起来，在切换到上一个界面时，使用对象输出

-(void) textFieldDidEndEditing:(UITextField *)textField

{

//判断语句实现区分name price summary

if(textName == textField)

{

editMovie.name = textField.text;

}

else if(textPrice == textField)

{

//转换类型赋值

int tmp = [textField.text intValue];//NSString -(int)intValue

editMovie.price = [NSNumber numberWithInt:tmp];

}

else if(textSummary == textField)

{

editMovie.summary = textField.text;

}

//打印

NSLog(@"%@",editMovie);

}

@end

界面显示：

效果图：

第一个界面：

界面显示：

第二个界面：

界面显示：

效果图：

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