iOS 五种传值方式
2024-04-15 09:48:26
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;
}@end2.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转载于:https://www.cnblogs.com/liumu/p/5343076.html
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