1、使用代理delegate的方法
2、使用通知Notification的方法
3、KVO等方法
4、block传值
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1、使用代理delegate的方法
#import "ViewController.h"
#import "SubViewController.h"
@interface ViewController ()<subViewDelegate>
@property(nonatomic,strong)UILabel *label;
@end
@implementation ViewController
-(UILabel *)label{
if (_label==nil) {
_label=[[UILabel alloc]initWithFrame:CGRectMake(100, 100, 150, 30)];
_label.backgroundColor=[UIColor grayColor];
//[self.view addSubview:_label];
}
return _label;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.view addSubview:self.label];
UIButton *button=[[UIButton alloc]initWithFrame:CGRectMake(100, 200, 100, 30)];
[button setBackgroundColor:[UIColor grayColor]];
[button setTitle:@"next" forState:UIControlStateNormal];
[button addTarget:self action:@selector(nextVC) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
-(void)nextVC{
NSLog(@"hhhhhhhhh");
SubViewController *subVC=[[SubViewController alloc]init];
subVC.delegate=self;
//[self.navigationController pushViewController:subVC animated:YES];
[self presentViewController:subVC animated:YES completion:^{
NSLog(@"cccccc");
}];
}
-(void)showStringFromSubView:(NSString *)textFieldtext{
self.label.text=textFieldtext;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
~~~~~~~~~~~~~~~~~~~~~~~
#import <UIKit/UIKit.h>
@protocol subViewDelegate <NSObject>
-(void)showStringFromSubView:(NSString *)textFieldtext;
@end
@interface SubViewController : UIViewController
@property(nonatomic,weak)id<subViewDelegate> delegate;
@end
#import "SubViewController.h"
@interface SubViewController ()
@property(nonatomic,strong)UITextField *textField;
@end
@implementation SubViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor=[UIColor whiteColor];
[self.view addSubview:self.textField];
//backBtn
UIButton *back= [UIButton buttonWithType:UIButtonTypeCustom];
back.frame=CGRectMake(100, 200, 50, 50);
[back setBackgroundColor:[UIColor grayColor]];
[back setTitle:@"back" forState:UIControlStateNormal];
[back addTarget:self action:@selector(backToPre) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:back];
}
-(void)backToPre{
[self.delegate showStringFromSubView:self.textField.text];
[self dismissViewControllerAnimated:YES completion:^{
NSLog(@"backToPre");
}];
}
-(UITextField *)textField{
if (_textField==nil) {
_textField=[[UITextField alloc]initWithFrame:CGRectMake(100, 100, 150, 30)];
_textField.backgroundColor=[UIColor grayColor];
}
return _textField;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~实现效果：
