屬性傳值

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屬性/方法傳值

//1.後面的介面定義了一個屬性,用於儲存,前一個介面,傳過來的值

//注:屬性定義成字串還是別的類型,取決於你的需求,本例我們需要一個字串,用於UILabel顯示

//2.後面的介面建立完畢之後,為屬性賦值,(即:記錄需要傳遞的值)

//3.在需要使用值的地方,使用屬性記錄的值這種通過定義屬性,達到傳值的方式,稱為屬性傳值,

//屬性傳值,一般用於從前一個介面向後一個介面傳值;

代碼如下:

#import "FirstViewController.h"#import "SecondViewController.h"#import "UIButton+Create.h"@interface FirstViewController (){    UITextField * _textField;//建立一個輸入框}@end@implementation FirstViewController- (void)dealloc{    [_textField release];    [super dealloc];}- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];            self.view.backgroundColor = [UIColor redColor];    self.navigationItem.title = @"首頁";    /**     *  1.在第一個介面建立一個輸入框     *       */    _textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 80, 200, 30)];    _textField.borderStyle = UITextBorderStyleRoundedRect;    [self.view addSubview:_textField];            /**     *  1.建立一個UIButton,     *  2.並添加響應事件,從首頁跳轉到第二個頁面.     */    UIButton * button = [UIButton systemButtonWithFrame:CGRectMake(100, 120, 50, 50) title:@"Push" target:self action:@selector(didClickButtonAction)];    [self.view addSubview:button];        // Do any additional setup after loading the view.}- (void)didClickButtonAction{        /**     *  1.用push的方法推出下一個頁面     *  2.把首頁輸入框輸入的字串,通過SecondViewController類的屬性NSString * text接收     *  3.從而實現把首頁輸入框輸入的字串,傳到第二頁的UILabel上.     */    SecondViewController * secondVC = [[SecondViewController alloc]init];    secondVC.text = _textField.text;    [self.navigationController pushViewController:secondVC animated:YES];    [secondVC release];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

#import "SecondViewController.h"@interface SecondViewController ()@end@implementation SecondViewController- (void)dealloc{    [_label release];    [super dealloc];}- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    self.view.backgroundColor = [UIColor orangeColor];    self.navigationItem.title = @"第二頁";    /**     *  1.在第二個介面建立一個UILabel     *  2.把首頁輸入框輸入的字串,通過SecondViewController類的屬性NSString * text接收     *  3.然後通過賦值給UILabel     */    _label = [[UILabel alloc]initWithFrame:CGRectMake(50, 80, 200, 30)];    _label.backgroundColor = [UIColor greenColor];    _label.text = self.text;    [self.view addSubview:_label];    // Do any additional setup after loading the view.}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}

屬性傳值