界面传值(+导航控制器) 复习
前提是想要实现界面传值 必须建立两个页面 这样才能实现界面之间的传值
在第一个页面RootViewController中
首先要引入第二个页面的头文件 SecondViewController.h
!!!!!!!!!!!!!在RootViewController.h 中写的
#import "RootViewController.h"
#import "TwoViewController.h"@interface RootViewController ()
//如果想要是方法中也能使用在属性中的TextField 必须建立一个属性
@property (nonatomic, retain)UITextField *tf1;
@end
@implementation RootViewController
//建立属性 必须dealloc
- (void)dealloc
{
[_tf1 release];
[super dealloc];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor lightGrayColor];
//以下属于设置navigationController的属性
//改变navigationController控制器栏的颜色
self.navigationController.navigationBar.barTintColor = [UIColor grayColor];
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
self.navigationController.navigationItem.title = @"猴赛雷";
//设置SegmentedControl的属性
UISegmentedControl *seg = [[[UISegmentedControl alloc]initWithItems:@[@"消息",@"电话"]]autorelease];
seg.frame = CGRectMake(0, 0, 100, 40);
self.navigationItem.titleView = seg;
//在左上角建立一个按钮
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(leftclick)]autorelease];
//通过属性建立的TextField 设置TextField
self.tf1 = [[UITextField alloc]initWithFrame:CGRectMake(50, 164, 150, 50)];
self.tf1.backgroundColor = [UIColor whiteColor];
[self.view addSubview:self.tf1];
[self.tf1 release];
self.tf1.placeholder = @"请输入......";
self.tf1.secureTextEntry = YES;
self.tf1.clearButtonMode = YES;
self.tf1.layer.borderColor = [UIColor cyanColor].CGColor;
self.tf1.layer.borderWidth = 2;
self.tf1.layer.cornerRadius = 2;
//设置button的属性
UIButton *bt1 = [UIButton buttonWithType:UIButtonTypeSystem];
bt1.frame = CGRectMake(0, 0, 50, 30);
bt1.center = CGPointMake(self.view.center.x, self.view.frame.size.height - 50);
bt1.backgroundColor = [UIColor yellowColor];
[self.view addSubview:bt1];
[bt1 addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];
[bt1 setTitle:@"点击" forState:UIControlStateNormal];
}
//实现左按钮的方法
- (void)leftclick
{
}
//实现button的方法 在方法内想要使页面进行传值的效果
- (void) click
{
//通过页面2建立一个对象 通过代理使页面1的text值传递给页面1
TwoViewController *two = [[TwoViewController alloc]init];
two.str = self.tf1.text;
two.delegate = self;
//push 通过push的方法传递给页面2
[self.navigationController pushViewController:two animated:YES];
}
//这是最后实现的代理方法
- (void)passValue:(NSString *)string
{
self.tf1.text = string;
}
**********************************************************
!!!!!!!!!!!!!!在页面2中SecondViewController.m中写
#import "TwoViewController.h"
@interface TwoViewController ()
//咋页面2中也得写属性 要不TextField无法再方法中使用
@property (nonatomic, retain)UITextField *tf2;
@end
@implementation TwoViewController
- (void)dealloc
{
[_str release];
[_tf2 release];
[super dealloc];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor redColor];
//建立一个页面2的TextField
self.tf2 = [[UITextField alloc]initWithFrame:CGRectMake(50, 164, 150, 50)];
self.tf2.backgroundColor = [UIColor whiteColor];
[self.view addSubview:self.tf2];
[self.tf2 release];
self.tf2.placeholder = @"请输入......";
self.tf2.clearButtonMode = YES;
self.tf2.layer.borderColor = [UIColor cyanColor].CGColor;
self.tf2.layer.borderWidth = 2;
self.tf2.layer.cornerRadius = 2;
//建立一个按钮 是为了点击返回页面1的
UIButton *bt1 = [UIButton buttonWithType:UIButtonTypeSystem];
bt1.frame = CGRectMake(0, 0, 50, 30);
bt1.center = CGPointMake(self.view.center.x, self.view.frame.size.height - 50);
bt1.backgroundColor = [UIColor yellowColor];
[self.view addSubview:bt1];
[bt1 addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];
[bt1 setTitle:@"点击" forState:UIControlStateNormal];
//设置代理人
self.tf2.text = self.str;
}
//实现按钮的点击方法
- (void)click
{
//通过代理人使页面2 的text 通过协议方法 传到代理人
[self.delegate passValue:self.tf2.text];
//pop方法 是为了使页面2的值可以传回页面1
[self.navigationController popToRootViewControllerAnimated:YES];
}
