属性传值
属性/方法传值
![](//img-blog.csdn.net/20140719113856740?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvenVveW91MTMxNA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
//1.后面的界面定义了一个属性,用于保存,前一个界面,传过来的值
//注:属性定义成字符串还是别的类型,取决于你的需求,本例我们须要一个字符串,用于UILabel显示
//2.后面的界面创建完成之后,为属性赋值,(即:记录须要传递的值)
//3.在须要使用值的地方,使用属性记录的值这样的通过定义属性,达到传值的方式,称为属性传值,
//属性传值,一般用于从前一个界面向后一个界面传值;
代码例如以下:
#import "FirstViewController.h" #import "SecondViewController.h" #import "UIButton+Create.h" @interface FirstViewController () { UITextField * _textField;//创建一个输入框 } @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 = @"首页"; /** * 1.在第一个界面创建一个输入框 * */ _textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 80, 200, 30)]; _textField.borderStyle = UITextBorderStyleRoundedRect; [self.view addSubview:_textField]; /** * 1.创建一个UIButton, * 2.并加入响应事件,从首页跳转到第二个页面. */ 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的方法推出下一个页面 * 2.把首页输入框输入的字符串,通过SecondViewController类的属性NSString * text接收 * 3.从而实现把首页输入框输入的字符串,传到第二页的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 = @"第二页"; /** * 1.在第二个界面创建一个UILabel * 2.把首页输入框输入的字符串,通过SecondViewController类的属性NSString * text接收 * 3.然后通过赋值给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. }