#import "ViewController.h"
#import "ModalViewController.h"
/*
传值:1.只要能拿到对方就能传值
顺传:给需要传值的对象,直接定义属性就能传值
逆传:用代理,block,就是利用block去代替代理
*/
@interface ViewController ()<ModalViewControllerDelegate>
@end
@implementation ViewController
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
ModalViewController *modalVc = [[ModalViewController alloc] init];
modalVc.view.backgroundColor = [UIColor brownColor];
modalVc.delegate = self;
// 跳转
[self presentViewController:modalVc animated:YES completion:nil];
}
#pragma mark - ModalViewControllerDelegate
// 传值给ViewController
- (void)modalViewController:(ModalViewController *)modalVc sendValue:(NSString *)value
{
NSLog(@"%@",value);
}
@end
#import <UIKit/UIKit.h>
@class ModalViewController;
@protocol ModalViewControllerDelegate <NSObject>
@optional
// 设计方法:想要代理做什么事情
- (void)modalViewController:(ModalViewController *)modalVc sendValue:(NSString *)value;
@end
@interface ModalViewController : UIViewController
@property (nonatomic, weak) id<ModalViewControllerDelegate> delegate;
@end
#import "ModalViewController.h"
@interface ModalViewController ()
@end
@implementation ModalViewController
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
// 传值给ViewController
if ([_delegate respondsToSelector:@selector(modalViewController:sendValue:)]) {
[_delegate modalViewController:self sendValue:@"123"];
}
}
@end
代理
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