iOS中几种传值的方式
1.ios里面传值的方式很多中现在介绍几种常用的传值方式:
第一种: 属性传值方式:
首先要建两个controller 分别为 RootviewController和 DetailviewController
在Detailviewcontrooler.h实现的代码:(暴露出属性)
#import <UIKit/UIKit.h>
@interface DetailViewController : UIViewController
@property (nonatomic,copy)NSString *textString;//属性传值
@end
在Detailviewcontroller.m里面的实现代码:
@interface DetailViewController ()
@end
@implementation DetailViewController
- (void)viewDidLoad {
[super viewDidLoad];
//添加一个返回按钮
UIButton *backBtn = [[UIButton alloc]initWithFrame:CGRectMake(15,30 , 60, 30)];
[backBtn addTarget:self action:@selector(BACK) forControlEvents:UIControlEventTouchUpInside];
[backBtn setTitle:@"返回" forState:UIControlStateNormal];
[self.view addSubview:backBtn];
//创建一个label,来接收传过来的数值
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(100, 200, 100, 30)];
label.textColor = [UIColor redColor];
label.backgroundColor = [UIColor grayColor];
label.textAlignment = NSTextAlignmentCenter;//对齐的方式
label.numberOfLines = 0; //不分行数
label.text = self.textString;//传值过来
[self.view addSubview:label];
}
-(void)BACK {
[self dismissViewControllerAnimated:NO completion:nil];
}
在Rootviewcontroller.m 的实现代码:
#import "RootViewController.h"
#import "DetailViewController.h"
@interface RootViewController ()
@property (nonatomic,retain)UITextField *textfield;
@end
@implementation RootViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.textfield = [[UITextField alloc]initWithFrame:CGRectMake(100, 30, 100, 30)];
self.textfield.backgroundColor = [UIColor grayColor];
self.textfield.layer.cornerRadius = 10.0;
[self.view addSubview:self.textfield];
//创建一个button传递事件
UIButton *custombutton = [[UIButton alloc]init];
custombutton.frame = CGRectMake(110, 100,80, 40);
[custombutton setTitle:@"入栈显示" forState:UIControlStateNormal ];
[custombutton addTarget:self action:@selector(handTap:) forControlEvents:UIControlEventTouchUpInside];
custombutton.backgroundColor = [UIColor redColor];
custombutton.layer.cornerRadius = 10.0;
[self.view addSubview:custombutton];
}
-(void)handTap:(UIButton *)sender{
DetailViewController *detailVC = [[DetailViewController alloc]init];
detailVC.textString = self.textfield.text;//后面的赋值给前面的
[self presentViewController:detailVC animated:NO completion:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
//点击空白处隐藏键盘
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesBegan:touches withEvent:event];
[self.view endEditing:YES]; //结束编辑
}
最后自己测试一下就可以成功了!!
第二种:通知(NOtification)传值: 直接上代码:<后面往前面传值的方法>
在.RootviewController.m的代码:
// 是后面往前面传值 b == > a
#import "RootViewController3.h"
#import "DetailViewController3.h"
@interface RootViewController3 ()
@property(nonatomic,strong)UILabel *label;
@end
@implementation RootViewController3
- (void)viewDidLoad {
[super viewDidLoad];
//注册一个通知
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(callBack:) name:@"test" object:nil];
//创建一个button传递事件
UIButton *custombutton = [[UIButton alloc]init];
custombutton.frame = CGRectMake(110, 100,80, 40);
[custombutton setTitle:@"rootVC" forState:UIControlStateNormal ];
[custombutton addTarget:self action:@selector(method) forControlEvents:UIControlEventTouchUpInside];
custombutton.backgroundColor = [UIColor redColor];
custombutton.layer.cornerRadius = 10.0;
[self.view addSubview:custombutton];
//创建一个label,来接收传过来的数值
self.label = [[UILabel alloc]initWithFrame:CGRectMake(100, 200, 100, 30)];
self.label.textColor = [UIColor redColor];
self.label.backgroundColor = [UIColor grayColor];
self.label.textAlignment = NSTextAlignmentCenter;//对齐的方式
self.label.numberOfLines = 0; //不分行数
[self.view addSubview:self.label];
}
-(void)method{
DetailViewController3 *detailVC = [[DetailViewController3 alloc]init];
[self presentViewController:detailVC animated:YES completion:nil];
}
-(void)callBack:(NSNotification *)noti{
NSLog(@"call bcak is notification");
self.label.text = noti.object;
[self dismissViewControllerAnimated:YES completion:nil];
}
在DetailViewController.m 的代码:
#import "DetailViewController3.h"
@interface DetailViewController3 ()
@property (nonatomic,strong) UITextField *textfield;
@end
@implementation DetailViewController3
- (void)viewDidLoad {
[super viewDidLoad];
//创建一个button传递事件
UIButton *custombutton = [[UIButton alloc]init];
custombutton.frame = CGRectMake(110, 100,80, 40);
[custombutton setTitle:@"DetailVC" forState:UIControlStateNormal ];
[custombutton addTarget:self action:@selector(handTap:) forControlEvents:UIControlEventTouchUpInside];
custombutton.backgroundColor = [UIColor redColor];
custombutton.layer.cornerRadius = 10.0;
[self.view addSubview:custombutton];
//创建一个label,来接收传过来的数值
self.textfield = [[UITextField alloc]initWithFrame:CGRectMake(100, 30, 100, 30)];
self.textfield.backgroundColor = [UIColor grayColor];
self.textfield.layer.cornerRadius = 10.0;
[self.view addSubview:self.textfield];
}
-(void)handTap:(UIButton *)sender
{
//发送一个通知
[[NSNotificationCenter defaultCenter]postNotificationName:@"test" object:self.textfield.text];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
测试一下就可以成功了!!
第三种:单例模式传值
首先创建一个单列对象:sington类
在sington.h的代码:
#import <Foundation/Foundation.h>
@interface Singtoln : NSObject
@property (nonatomic,strong)NSString *singletonValue;
+(instancetype)shareSingleton ;
@end
在sington.m的代码:
#import "Singtoln.h"
static Singtoln *singtolnManager = nil;
@implementation Singtoln
+(instancetype)shareSingleton{
@synchronized(self){
if (singtolnManager == nil) {
singtolnManager = [[Singtoln alloc]init];
}
}
return singtolnManager;
}
@end
在RootviewController.m的代码:
#import "RootViewController4.h"
#import "DetailViewController4.h"
#import "Singtoln.h"
@interface RootViewController4 ()
@property (nonatomic,strong)UITextField *textField;
@end
@implementation RootViewController4
- (void)viewDidLoad {
[super viewDidLoad];
//创建一个button传递事件
UIButton *custombutton = [[UIButton alloc]init];
custombutton.frame = CGRectMake(110, 100,80, 40);
[custombutton setTitle:@"单例传值" forState:UIControlStateNormal ];
[custombutton addTarget:self action:@selector(method) forControlEvents:UIControlEventTouchUpInside];
custombutton.backgroundColor = [UIColor redColor];
custombutton.layer.cornerRadius = 10.0;
[self.view addSubview:custombutton];
self.textField = [[UITextField alloc]init];
self.textField.frame = CGRectMake(100, 150,100,40);
self.textField.backgroundColor = [UIColor grayColor];
self.textField.layer.cornerRadius = 5;
[self.view addSubview:self.textField];
}
-(void)method{
Singtoln *singtoln = [Singtoln shareSingleton];
singtoln.singletonValue = self.textField.text;
DetailViewController4 *detail4VC = [[DetailViewController4 alloc]init];
[self presentViewController: detail4VC animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
在DetailViewController.m的代码:
#import "DetailViewController4.h"
#import "Singtoln.h"
@interface DetailViewController4 ()
@property (nonatomic,strong)UITextField *textfield;
@end
@implementation DetailViewController4
- (void)viewDidLoad {
[super viewDidLoad];
self.textfield = [[UITextField alloc]init];
self.textfield.backgroundColor = [UIColor grayColor];
self.textfield.frame = CGRectMake(100, 60, 100, 40);
self.textfield.textAlignment = NSTextAlignmentCenter;
self.textfield.layer.cornerRadius = 10;
[self.view addSubview:self.textfield];
self.textfield.text = [Singtoln shareSingleton].singletonValue;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
第四种:代理传值:(后面往前面传值)
在rootviewcontroller.h的代码:
#import "RootViewController2.h"
#import "DetailViewController2.h"
@interface RootViewController2 ()<PassingDelegate>
@property (nonatomic,strong)UILabel *label;
@end
@implementation RootViewController2
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIButton *customBtn = [[UIButton alloc]init];
customBtn.frame = CGRectMake(130, 50,80, 40);
customBtn.backgroundColor = [UIColor redColor];
[customBtn setTitle:@"代理传值" forState:UIControlStateNormal];
customBtn.tintColor = [UIColor blackColor];
[customBtn addTarget:self action:@selector(handTap:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:customBtn];
//创建一个label接受的传过来的值
self.label = [[UILabel alloc]init];
self.label.frame = CGRectMake(100, 100, 150, 30);
self.label.layer.cornerRadius = 10;
self.label.backgroundColor = [UIColor grayColor];
self.label.tintColor = [UIColor redColor];
[self.view addSubview:self.label];
}
-(void)handTap:(UIButton *)sender{
DetailViewController2 *detail2VC = [[DetailViewController2 alloc]init];
detail2VC.delegate = self;
[self presentViewController:detail2VC animated:NO completion:nil];
}
-(void)changeTitle:(NSString *)str{
self.label.text = str;
NSLog(@"%@",str);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
在DetailviewController.m的代码:
#import "RootViewController2.h"
#import "DetailViewController2.h"
@interface RootViewController2 ()<PassingDelegate>
@property (nonatomic,strong)UILabel *label;
@end
@implementation RootViewController2
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIButton *customBtn = [[UIButton alloc]init];
customBtn.frame = CGRectMake(130, 50,80, 40);
customBtn.backgroundColor = [UIColor redColor];
[customBtn setTitle:@"代理传值" forState:UIControlStateNormal];
customBtn.tintColor = [UIColor blackColor];
[customBtn addTarget:self action:@selector(handTap:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:customBtn];
//创建一个label接受的传过来的值
self.label = [[UILabel alloc]init];
self.label.frame = CGRectMake(100, 100, 150, 30);
self.label.layer.cornerRadius = 10;
self.label.backgroundColor = [UIColor grayColor];
self.label.tintColor = [UIColor redColor];
[self.view addSubview:self.label];
}
-(void)handTap:(UIButton *)sender{
DetailViewController2 *detail2VC = [[DetailViewController2 alloc]init];
detail2VC.delegate = self;
[self presentViewController:detail2VC animated:NO completion:nil];
}
-(void)changeTitle:(NSString *)str{
self.label.text = str;
NSLog(@"%@",str);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
