IOS开发笔记（2）页面之间传递数据几种方式比较

来源：互联网发布：凯旋软件编辑：程序博客网时间：2024/04/30 16:26

今天分享一下页面之间传值的几种方式

1、@property属性

这个不用多说了吧，当页面A 跳转到页面B，在class B中声明属性

@property (nonatomic, copy) NSString *name;

初始化B

FirstViewController *firstVC = [FirstViewController new];firstVC.name = @"name";[self presentViewController:firstVC animated:YES completion:nil];

2、Delegate

当页面A 跳转到页面B，B页面返回时传值给A，可以这样实现，在class B中定义一个@protocol，并声明属性delegate;

#import <UIKit/UIKit.h>@protocol FirstViewControllerDelegate <NSObject>- (void)print;@end@interface FirstViewController : UIViewController@property (nonatomic, assign) id<FirstViewControllerDelegate> delegate;@end

.m文件

- (void)backClick:(UIButton *)sender{    [self dismissViewControllerAnimated:YES completion:^{                if ([self.delegate respondsToSelector:@selector(print)]) {            [self.delegate print];        }    }];}

页面A .m实现，要继承FirstViewController的代理

- (void)buttonClicked:(UIButton *)sender{    FirstViewController *firstVC = [FirstViewController new];    firstVC.delegate = self;    [self presentViewController:firstVC animated:YES completion:nil];}#pragma mark - FirstViewControllerDelegate- (void)print{    NSLog(@"delegate response");}

3、Block

当页面A 跳转到页面B，B页面返回时传值给A，可以这样实现，在class B中定义一个block，并声明属性block

#import <UIKit/UIKit.h>typedef void (^FirstViewControllerBlock)(NSString *str);@interface FirstViewController : UIViewController@property (nonatomic, copy) FirstViewControllerBlock block;@end

.m文件

- (void)backClick:(UIButton *)sender{    self.block(@"first block");    [self dismissViewControllerAnimated:YES completion:nil];}

页面A .m实现

- (void)buttonClicked:(UIButton *)sender{    FirstViewController *firstVC = [FirstViewController new];    [self presentViewController:firstVC animated:YES completion:nil];    firstVC.block = ^(NSString *str) {        NSLog(@"str is: %@", str);    };}

4、NSNotification

（未完，待续。。。）

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