iPhone界面跳转及页面传值

由于第一次博客，可能有很多差强人意的地方，但还是试着写一下吧

这次的内容如标题一样，那么以下内容为要实现的功能。

1,创建Empty Application的模板工程,添加model类Movie,包含三个属性: NSString* title;Number* boxOfficeGross;NSString* summary;并添加相应的 初始化方法,set,get方法,以及NSCoding,NSCoying等协议

#import <Foundation/Foundation.h>
@interface Movie : NSObject<NSCopying,NSCoding>
@property(nonatomic,strong)NSString* title;
@property(nonatomic,strong)NSNumber* boxOfficeGross;
@property(nonatomic,strong)NSString* summary;
-(id)initWithTitle:(NSString*)title andNum:(NSNumber*)boxOfficeGross andSum:(NSString*)summary;
+(id)MovieWithTitle:(NSString*)title andNum:(NSNumber*)boxOfficeGross andSum:(NSString*)summary;
@end

#import "Movie.h"

@implementation Movie
-(id)initWithTitle:(NSString*)title andNum:(NSNumber*)boxOfficeGross andSum:(NSString*)summary
{
    if (self = [super init]) {
        self.title = title;
        self.boxOfficeGross = boxOfficeGross;
        self.summary = summary;
    }
    return self;
}
+(id)MovieWithTitle:(NSString*)title andNum:(NSNumber*)boxOfficeGross andSum:(NSString*)summary
{
    Movie * movie = [[Movie alloc] initWithTitle:title andNum:boxOfficeGross andSum:summary];
    return movie;
}
-(void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.title forKey:@"TITLE"];
    [aCoder encodeObject:self.boxOfficeGross forKey:@"BOXGROSS"];
    [aCoder encodeObject:self.summary forKey:@"SUMMARY"];
}
-(id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super init]) {
        self.title = [aDecoder decodeObjectForKey:@"TITLE"];
        self.boxOfficeGross = [aDecoder decodeObjectForKey:@"BOXGROSS"];
        self.summary = [aDecoder decodeObjectForKey:@"SUMMARY"];
    }
    return self;
}
-(id)copyWithZone:(NSZone *)zone
{
    Movie * movie = [[Movie allocWithZone:zone] init];
    [movie setTitle:self.title];
    [movie setBoxOfficeGross:self.boxOfficeGross];
    [movie setSummary:self.summary];
    return movie;
}
-(NSString *)description
{
    return [NSString stringWithFormat:@"%@%@%@",self.title,self.boxOfficeGross,self.summary];
}
- (void)dealloc
{

}
@end

2,在根视图控制器中(MovieViewController)声明一个Movie对象,并将此对象的内容显示在界面中(label作为显示控件)。

#import <UIKit/UIKit.h>
#import "Movie.h"
@interface MainViewController : UIViewController
@property(nonatomic,retain)Movie* movie;
@end

#import "MainViewController.h"
#import "Movie.h"
#import "EditeViewController.h"
@interface MainViewController ()
@property(nonatomic,strong)UILabel*label11;
@property(nonatomic,strong)UILabel*label22;
@property(nonatomic,strong)UILabel*label33;
@end

@implementation MainViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self addclass];
    [self _initUI];
    
}
//      刷新：当第二界面重新跳转到第一页面时，用于刷新第一页面的显示内容
- (void)updateUI
{
    _label11.text = _movie.title;
    _label22.text = [NSString stringWithFormat:@"%@",_movie.boxOfficeGross];
    _label33.text = _movie.summary;
}
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self updateUI];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (void)click:(id)sender
{

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>点击事件，跳转到第二页面，同时将第一页面中label的内容传给第二页面的指定控件接收</span>

    EditeViewController * viewController = [[EditeViewController alloc] init];
    viewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;

    [self presentViewController:viewController animated:YES completion:nil];

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>传值方法之：控件传值（需要写在跳转方法的后面，如果是实例变量传值，那么就要写在跳转方法的前面）</span>

    viewController.text1.text = _label11.text;
    viewController.text2.text = _label22.text;
    viewController.text3.text = _label33.text;

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>利用retain浅拷贝实现第二页面内容与第一页面内容同步。（指向同一空间）</span>

    viewController.movie2 = self.movie;
}
- (void)_initUI
{

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>初始化一个背景视图</span>

    UIImageView* image = [[UIImageView alloc] init];
    image.frame = CGRectMake(0, 0, 320, 480);
    [image setImage:[UIImage imageNamed:@"路.jpg"]];
    [self.view addSubview:image];
    UIImageView* image1 = [[UIImageView alloc] init];
    image1.frame = CGRectMake(150, 100, 140, 40);
//    [image1 setImage:[UIImage imageNamed:@"next_btn@2x"]];
    [self.view addSubview:image1];
    UIImageView* image2 = [[UIImageView alloc] init];
    image2.frame = CGRectMake(150, 200, 140, 40);
//    [image2 setImage:[UIImage imageNamed:@"next_btn@2x"]];
    [self.view addSubview:image2];
    UIImageView* image3 = [[UIImageView alloc] init];
    image3.frame = CGRectMake(150, 300, 140, 100);
//    [image3 setImage:[UIImage imageNamed:@"next_btn@2x"]];
    [self.view addSubview:image3];

    UILabel * label1 = [[UILabel alloc] init];
    label1.frame = CGRectMake(0, 100, 140, 40);
    [label1 setTextAlignment:NSTextAlignmentRight];
    [label1 setText:@"电影名称:"];
    [label1 setFont:[UIFont systemFontOfSize:12]];
    [label1 setTextColor:[UIColor blackColor]];
    
    _label11 = [[UILabel alloc] init];
    _label11.frame = CGRectMake(150, 100, 140, 40);
    [_label11 setTextAlignment:NSTextAlignmentCenter];
    [_label11 setText:_movie.title];
    [_label11 setFont:[UIFont systemFontOfSize:12]];
    [_label11 setTextColor:[UIColor blackColor]];
    
    UILabel * label2 = [[UILabel alloc] init];
    label2.frame = CGRectMake(0, 150, 140, 40);
    [label2 setTextAlignment:NSTextAlignmentRight];
    [label2 setText:@"票房数:"];
    [label2 setFont:[UIFont systemFontOfSize:12]];
    [label2 setTextColor:[UIColor blackColor]];
    
    _label22 = [[UILabel alloc] init];
    _label22.frame = CGRectMake(150, 150, 140, 40);
    [_label22 setTextAlignment:NSTextAlignmentCenter];
    [_label22 setText:[NSString stringWithFormat:@"%@", _movie.boxOfficeGross]];
    [_label22 setFont:[UIFont systemFontOfSize:12]];
    [_label22 setTextColor:[UIColor blackColor]];
    
    UILabel * label3 = [[UILabel alloc] init];
    label3.frame = CGRectMake(0, 200, 320, 40);
    [label3 setTextAlignment:NSTextAlignmentCenter];
    [label3 setText:@"内容简介:"];
    [label3 setFont:[UIFont systemFontOfSize:12]];
    [label3 setTextColor:[UIColor blackColor]];
    
    _label33 = [[UILabel alloc] init];
    _label33.frame = CGRectMake(0, 250, 320, 100);
    [_label33 setTextAlignment:NSTextAlignmentCenter];
    [_label33 setText:_movie.summary];
    _label33.numberOfLines=0;//自动换行
    [_label33 setFont:[UIFont systemFontOfSize:12]];
    [_label33 setTextColor:[UIColor blackColor]];
    
    UIButton * btn = [[UIButton alloc] init];
    btn.frame = CGRectMake(0, 400, 320, 50);
    [btn setTitle:@"编辑" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [btn setBackgroundImage:[UIImage imageNamed:@"next_btn@2x"] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
    
    [self.view addSubview:_label11];
    [self.view addSubview:_label22];
    [self.view addSubview:_label33];
    [self.view addSubview:label1];
    [self.view addSubview:label2];
    [self.view addSubview:label3];
}

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>初始化Movie的一个对象，用于显示在第一第二页面。</span>

- (void)addclass
{
    NSNumber * num=[NSNumber numberWithLong:1646123];
    _movie = [Movie MovieWithTitle:@"复仇者联盟2" andNum:num andSum:@"《复仇者联盟2：奥创纪元》（Avengers: Age of Ultron）是漫威影业出品的一部科幻冒险电影，取材自漫威漫画，是漫威电影宇宙第11部电影。由乔斯·韦登执导，小罗伯特·唐尼、克里斯·埃文斯、克里斯·海姆斯沃斯、马克·鲁法洛、斯嘉丽·约翰逊和杰瑞米·雷纳主演，定于2015年5月1日北美上映。影片讲述当钢铁侠试图启动处于休眠状态的维持和平计划时，事情出了差错。于是，在地球面临生死存亡的紧急关头时，强大的超级英雄们挺身而出承担起拯救世界的重任，他们将阻止可怕的人工智能机器人“奥创”制定恐怖计划。"];
}
@end

3,点击在根视图控制器中的“修改”按钮,进入EditViewController,并将 根视图的label内容显示在EditViewController的三个textField中。

#import <UIKit/UIKit.h>
#import "Movie.h"
@interface EditeViewController : UIViewController<UITextFieldDelegate,UITextViewDelegate>
@property(nonatomic,strong)UITextField* text1;
@property(nonatomic,strong)UITextField* text2;
@property(nonatomic,strong)UITextView* text3;
@property(nonatomic,retain)Movie*movie2;

@end

#import "EditeViewController.h"
#import "MainViewController.h"
@interface EditeViewController ()
@end

@implementation EditeViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self _initUI];

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>代理模式，在重写touch方式时，要遵循<</span><span class="s1" style="font-family: Arial, Helvetica, sans-serif;">UITextFieldDelegate</span><span class="s2" style="font-family: Arial, Helvetica, sans-serif;">,</span><span class="s1" style="font-family: Arial, Helvetica, sans-serif;">UITextViewDelegate</span><span class="s2" style="font-family: Arial, Helvetica, sans-serif;">>协议，再设置代理模式，达到点击控件textview时，界面上移下移的目的</span>

    _text3.delegate = self;
    
}

<span style="font-family: Arial, Helvetica, sans-serif;">//    初始化页面控件</span>

- (void)_initUI
{
    UIButton * btn = [[UIButton alloc] init];
    btn.frame = CGRectMake(0, 400, 320, 50);
    [btn setTitle:@"保存" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [btn setBackgroundImage:[UIImage imageNamed:@"next_btn@2x"] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
    
    UILabel * label_text1 = [[UILabel alloc] init];
    label_text1.frame = CGRectMake(0, 100, 140, 40);
    [label_text1 setTextAlignment:NSTextAlignmentCenter];
    [label_text1 setText:@"电影名称："];
    [label_text1 setFont:[UIFont systemFontOfSize:12]];
    [label_text1 setTextColor:[UIColor blueColor]];
    [self.view addSubview:label_text1];
    _text1 = [[UITextField alloc] init];
    _text1.frame = CGRectMake(150, 100, 100, 40);
    
    _text1.borderStyle = UITextBorderStyleRoundedRect;
    [_text1 setTextAlignment:NSTextAlignmentCenter];
    _text1.placeholder = @"请输入";
    _movie2.title = _text1.text;
    [self.view addSubview:_text1];
    
    UILabel * label_text2 = [[UILabel alloc] init];
    label_text2.frame = CGRectMake(0, 200, 140, 40);
    [label_text2 setTextAlignment:NSTextAlignmentCenter];
    [label_text2 setText:@"当前票房纪录："];
    [label_text2 setFont:[UIFont systemFontOfSize:12]];
    [label_text2 setTextColor:[UIColor blueColor]];
    [self.view addSubview:label_text2];
    _text2 = [[UITextField alloc] init];
    _text2.frame = CGRectMake(150, 200, 100, 40);
    //    text1.background = [UIImage imageNamed:@"next_btn@2x"];
    _text2.borderStyle = UITextBorderStyleRoundedRect;
    [_text2 setTextAlignment:NSTextAlignmentCenter];
    _text2.placeholder = @"请输入";
//    _movie2.boxOfficeGross = _text2.text;
    [self.view addSubview:_text2];
    
    UILabel * label_text3 = [[UILabel alloc] init];
    label_text3.frame = CGRectMake(0, 300, 140, 40);
    [label_text3 setTextAlignment:NSTextAlignmentCenter];
    [label_text3 setText:@"影片简介："];
    [label_text3 setFont:[UIFont systemFontOfSize:12]];
    [label_text3 setTextColor:[UIColor blueColor]];
    [self.view addSubview:label_text3];
    _text3 = [[UITextView alloc] init];
    _text3.frame = CGRectMake(150, 300, 100, 40);
    
    [_text3 setTextAlignment:NSTextAlignmentCenter];
    _movie2.summary = _text3.text;
    [self.view addSubview:_text3];
}
<pre name="code" class="objc"><span style="font-family: Arial, Helvetica, sans-serif;">//  开始对textview编辑后，点击textview控件，自动调用该方法</span>

- (void)textViewDidBeginEditing:(UITextView *)textView{ [UIView animateWithDuration:0.3 animations:^{ self.view.frame = CGRectMake(0, -200, 320, 480); }];}

<span style="font-family: Arial, Helvetica, sans-serif;">//  结束对textview编辑后，点击空白，自动调用该方法</span>

- (void)textViewDidEndEditing:(UITextView *)textView
{
    self.view.frame = CGRectMake(0,0, 320, 480);
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    [UIView animateWithDuration:0.3 animations:^{
        self.view.frame = CGRectMake(0, -200, 320, 480);
    }];
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
    self.view.frame = CGRectMake(0,0, 320, 480);
}

//#pragma mark 触控事件，点击textField时，隐藏键盘
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [_text1 resignFirstResponder];  <span style="font-family: Arial, Helvetica, sans-serif;">//点击_text1后，再次点击空白处隐藏键盘</span>
    [_text2 resignFirstResponder];  <span style="font-family: Arial, Helvetica, sans-serif;">//点击_text2</span><span style="font-family: Arial, Helvetica, sans-serif;">后，再次点击空白处</span><span style="font-family: Arial, Helvetica, sans-serif;">隐藏键盘
</span>    [_text3 resignFirstResponder];  <span style="font-family: Arial, Helvetica, sans-serif;">//点击_text3</span><span style="font-family: Arial, Helvetica, sans-serif;">后，再次点击空白处</span><span style="font-family: Arial, Helvetica, sans-serif;">隐藏键盘</span><span style="font-family: Arial, Helvetica, sans-serif;">
</span>}

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>点击_text1控件编辑结束后，点击键盘中的Return键时，实现隐藏键盘的目的</span>

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [_text1 resignFirstResponder];
    
    return YES;
}
- (void)click:(id)sender
{

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>实现第二页面向第一页面传值的操作，因为第一，第二页面都定义了一个Movie的属性，利用retain浅拷贝实现第二页面修改，第一页面显示修改后的内容</span>

    _movie2.title = _text1.text;
    _movie2.boxOfficeGross = [NSNumber numberWithLong:[_text2.text integerValue]];
    _movie2.summary = _text3.text;

<span style="font-family: Arial, Helvetica, sans-serif;">//<span style="white-space:pre">	</span>跳转到上一个页面</span>

    [self dismissViewControllerAnimated:YES completion:nil];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

@end

4,修改DetailViewController的textField中的值并返回到根视图时,label的值相 应改变。