属性传值

属性/方法传值

//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.
}