iOS使用代理模式从后往前传值

来源：互联网发布：win10 安装ubuntu 分区编辑：程序博客网时间：2024/05/29 23:48

①在后面的控制器的 .h文件中声明协议和代理方法

#import <UIKit/UIKit.h>

@protocol NewControllerDelegate <NSObject>

- (void)text:(NSString *)str;

@end

@interface NewViewController : UIViewController

@property (nonatomic,assign) id <NewControllerDelegate> delegate;

@end

②在后面控制器的 .m文件中将值传入代理方法中

if (self.delegate && [self.delegaterespondsToSelector:@selector(text:)]) {

[self.delegatetext:@"啊啊啊"];

}

③在前面控制器的 .m文件中遵守协议,设置代理,实现代理方法

#import "ViewController.h"

#import "NewViewController.h"

@interface ViewController () <NewControllerDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {

[superviewDidLoad];

UIButton *button = [UIButtonbuttonWithType:(UIButtonTypeRoundedRect)];

button.frame = CGRectMake(0, 100, 100,100);

button.backgroundColor = [UIColorredColor];

[button addTarget:selfaction:@selector(push)forControlEvents:(UIControlEventTouchUpInside)];

[self.viewaddSubview:button];

}

- (void)push

{

NewViewController *newVC = [[NewViewControlleralloc] init];

newVC.delegate = self;

[self.navigationControllerpushViewController:newVC animated:YES];

}

- (void)text:(NSString *)str

{

NSLog(@"%@", str);

}

④最后实现效果是:当我点击后面控制器的返回按钮时,控制台打印出了"啊啊啊".

到此,完成从后面控制器向前面控制器传值.

5 0