iOS 五种传值方式
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1.属性传值和代理传值
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
@interface ViewController : UIViewController<UITextFieldDelegate,postValuedelegate>
@property (nonatomic ,strong) UITextField *textfld;
@property (nonatomic ,strong) UIButton *button;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//设置背景色
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"18103807_114944308127_2.jpg"]];
self.textfld = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.textfld.backgroundColor = [UIColor grayColor];
self.textfld.textColor = [UIColor blueColor];
//指定隐藏键盘的代理
self.textfld.delegate = self;
[self.view addSubview:self.textfld];
//设置跳到下一页的按钮
self.button = [[UIButton alloc] initWithFrame:CGRectMake(120, 160, 80, 40)];
[self.button setTitle:@"下一页" forState:UIControlStateNormal];
[self.button addTarget:self action:@selector(nextPage) forControlEvents: UIControlEventTouchUpInside ];
[self.view addSubview:self.button];
}
//隐藏键盘
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
if ([self.textfld isFirstResponder]) {
[self.textfld resignFirstResponder];
}
return YES;
}
-(void)nextPage
{
SecondViewController *second = [[SecondViewController alloc] init];
//把本页的值赋给下一页的属性，实现传值
second.str = self.textfld.text;
[self presentViewController:second animated:YES completion:^{
NSLog(@"跳转成功");
}];
second.delegate = self;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//实现代理方法
-(void)postValue:(NSString *)info{
self.textfld.text = info;
}
@end
//第二页代码
#import <UIKit/UIKit.h>
//申明一个传值协议
@protocol postValuedelegate <NSObject>
//传值协议的方法
-(void)postValue:(NSString *) info;
@end
@interface SecondViewController : UIViewController<UITextFieldDelegate>
@property (nonatomic ,strong) NSString *str;
@property (nonatomic ,strong) UITextField *textFil;
@property (nonatomic ,assign) id<postValuedelegate> delegate;
@end
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"5622630220130817130527093.jpg"]];
self.textFil = [[UITextField alloc ] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.textFil.backgroundColor = [UIColor grayColor];
self.textFil.textColor = [UIColor greenColor];
//属性传值
self.textFil.text = self.str;
self.textFil.delegate = self;
[self.view addSubview:self.textFil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
if (self.delegate) {
[self.delegate postValue:self.textFil.text];
}
if ([self.textFil isFirstResponder]) {
[self.textFil resignFirstResponder];
}
[self dismissViewControllerAnimated:YES completion:nil];
return YES;
}
@end
2.代码块传值
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
@interface ViewController : UIViewController<UITextFieldDelegate>
@property (nonatomic ,strong) UITextField *textName;
@property (nonatomic ,strong) UIButton *button;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"5622630220130817130527093.jpg"]];
self.textName = [[UITextField alloc ] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.textName.backgroundColor = [UIColor grayColor];
self.textName.textColor = [UIColor greenColor];
self.textName.delegate = self;
[self.view addSubview:self.textName];
self.button = [[UIButton alloc] initWithFrame:CGRectMake(120, 160, 80, 40)];
[self.button setTitle:@"下一页" forState:UIControlStateNormal];
[self.button addTarget:self action:@selector(nextPage) forControlEvents: UIControlEventTouchUpInside ];
[self.view addSubview:self.button];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
if ([self.textName isFirstResponder]) {
[self.textName resignFirstResponder];
}
return YES;
}
-(void)nextPage
{
SecondViewController *second = [[SecondViewController alloc] init];
second.str = self.textName.text;
second.postvalueb = ^(NSString *str){
self.textName.text = str;
NSLog(@"%@",str);
};
[self presentViewController:second animated:YES completion:^{
NSLog(@"页面跳转成功");
}];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
#import <UIKit/UIKit.h>
typedef void(^postValueBlock)(NSString *);
@interface SecondViewController : UIViewController<UITextFieldDelegate>
@property (nonatomic ,strong) NSString *str;
@property (nonatomic ,strong) postValueBlock postvalueb;
@property (nonatomic ,strong) UITextField *textFil;
@end
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)viewDidLoad {
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"5622630220130817130527093.jpg"]];
self.textFil = [[UITextField alloc ] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.textFil.backgroundColor = [UIColor grayColor];
self.textFil.textColor = [UIColor greenColor];
//属性传值
self.textFil.text = self.str;
self.textFil.delegate = self;
[self.view addSubview:self.textFil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if(self.postvalueb){
self.postvalueb(self.textFil.text);
}
if ([self.textFil isFirstResponder]) {
[self.textFil resignFirstResponder];
}
[self dismissViewControllerAnimated:YES completion:nil];
return YES;
}
@end
3.单列传值
#import <UIKit/UIKit.h>
//创建一个单列类
@interface MyPickerView : UIPickerView<NSCopying>
+(MyPickerView *)shareInstance;
@end
//创建一个单列类
#import "MyPickerView.h"
static MyPickerView *singleton;
@implementation MyPickerView
+(MyPickerView *)shareInstance
{ if(singleton == nil)
{
singleton = [[MyPickerView alloc] init];
}
return singleton;
}
+(instancetype)allocWithZone:(struct _NSZone *)zone{
if (singleton == nil) {
singleton = [super allocWithZone:zone];
}
return singleton;
}
-(id)copyWithZone:(NSZone *)zone
{
return self;
}
@end
#import <UIKit/UIKit.h>
#import "MyPickerView.h"
#import "SecondViewController.h"
@interface ViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>
@property (nonatomic ,strong) NSArray *array;
@property (nonatomic ,strong) MyPickerView *mypickerV;
@property (nonatomic ,strong) UIButton *button;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor brownColor];
self.array = @[@"aa",@"bb",@"cc",@"dd"];
self.mypickerV = [[MyPickerView alloc] initWithFrame:CGRectMake(100, 200, 100, 100)];
self.mypickerV.delegate = self;
self.mypickerV.dataSource = self;
self.mypickerV.backgroundColor = [UIColor grayColor];
[self.view addSubview:self.mypickerV];
self.button = [[UIButton alloc] initWithFrame:CGRectMake(100, 310, 100, 40)];
self.button.backgroundColor = [UIColor greenColor];
[self.button setTitle:@"下一页" forState: UIControlStateNormal];
[self.button addTarget:self action:@selector(nextPage) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.button];
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return self.array.count;
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
return self.array[row];
}
-(void)nextPage
{
SecondViewController *second = [[SecondViewController alloc] init];
[self presentViewController:second animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
#import <UIKit/UIKit.h>
#import "MyPickerView.h"
#import "ThirdViewController.h"
@interface SecondViewController : UIViewController
@property (nonatomic ,strong) MyPickerView *mypick;
@property (nonatomic ,strong) UIButton *button;
@end
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor blueColor];
self.mypick = [[MyPickerView alloc] init];
[self.view addSubview:self.mypick];
self.button = [[UIButton alloc] initWithFrame:CGRectMake(100, 310, 100, 40)];
self.button.backgroundColor = [UIColor greenColor];
[self.button setTitle:@"下一页" forState: UIControlStateNormal];
[self.button addTarget:self action:@selector(nextPage) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.button];
self. mypick.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"u=113715476,712357466&fm=21&gp=0.jpg"]];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
-(void)nextPage
{
ThirdViewController *third = [[ThirdViewController alloc] init];
[self viewDidAppear:YES];
[self presentViewController:third animated:YES completion:nil];
}
@end
#import <UIKit/UIKit.h>
#import "MyPickerView.h"
#import "ViewController.h"
@interface ThirdViewController : UIViewController
@property (nonatomic ,strong) MyPickerView *mypick;
@property (nonatomic ,strong) UIButton *button;
@end
#import "ThirdViewController.h"
@interface ThirdViewController ()
@end
@implementation ThirdViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.mypick = [[MyPickerView alloc] init];
[self.view addSubview:self.mypick];
self.button = [[UIButton alloc] initWithFrame:CGRectMake(100, 310, 100, 40)];
self.button.backgroundColor = [UIColor greenColor];
[self.button setTitle:@"下一页" forState: UIControlStateNormal];
[self.button addTarget:self action:@selector(nextPage) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.button];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)nextPage
{
ViewController *second = [[ViewController alloc] init];
[self presentViewController:second animated:YES completion:nil];
}
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
}
@end
4.通知传值
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
NSDictionary *dic = @{@"name":@"liumu",
@"age":@"22"};
NSNotification *notification = [[NSNotification alloc] initWithName:@"show" object:nil userInfo:dic];
// 取value值
[[NSNotificationCenter defaultCenter]
postNotificationName:@"show" object:notification];
//发送消息取键值
// [[NSNotificationCenter defaultCenter] postNotification:notification];
SecondViewController *second = [[SecondViewController alloc] init];
[self presentViewController:second animated:YES completion:nil];
}
@end
#import <UIKit/UIKit.h>
@interface SecondViewController : UIViewController
@property (nonatomic ,strong) UITextField *TextFil;
@end
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor purpleColor];
self.TextFil.backgroundColor = [UIColor blueColor];
self.TextFil = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
self.TextFil.textColor = [UIColor greenColor];
[self.view addSubview:self.TextFil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(Show:) name:@"show" object:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
//传值
-(void)Show:(NSNotification *)notification
{
NSString *str=(NSString *)[notification object];
//self.TextFil.text = str;
NSLog(@"%@",str);
}
//注册完毕，销毁通知
-(void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self name:@"show" object:nil];
}
@end
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