刚学习苹果开发的时候不懂代理，Block，感觉好麻烦，就知道大概意思，现在回头看，发现就懂了，留一份自己的Demo希望初学的人能够看出点什么。
代理传值：在第二个界面输入值传给第一个界面
MainViewController
#import <UIKit/UIKit.h>@interface MainViewController : UIViewController
@property (nonatomic, retain) UITextField *labelTwo;
@end#import "MainViewController.h"
#import "OtherViewController.h"
@interface MainViewController ()<OtherViewDelegate>
{
NSString *_str;
}
@end@implementation MainViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
self.view.backgroundColor = [UIColor whiteColor];
}
return self;
}- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_labelTwo = [[UITextField alloc]initWithFrame:CGRectMake(160, 200, 70, 44)];
_labelTwo.backgroundColor = [UIColor grayColor];
[self.view addSubview:_labelTwo];UIButton *buttonTow = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[buttonTow setTitle:@"推" forState:UIControlStateNormal];
buttonTow.frame = CGRectMake(160,100, 70, 44);
[self.view addSubview:buttonTow];
[buttonTow addTarget:self action:@selector(tuiPush) forControlEvents:UIControlEventTouchUpInside];
}- (void)tuiPush
{
OtherViewController *view = [[OtherViewController alloc] init];
view.delegate = self;
[self.navigationController pushViewController:view animated:YES];
}- (void)OtherViewLabel:(UITextField *)labelOne
{
_labelTwo.text = labelOne.text;
}
第二个界面：OtherViewController
#import <UIKit/UIKit.h>
@protocol OtherViewDelegate<NSObject>- (void)OtherViewLabel:(UITextField *)labelOne;
@end
@interface OtherViewController : UIViewController
@property (nonatomic, retain) UITextField *labelOne;
@property (nonatomic, weak)id<OtherViewDelegate>delegate;
@end#import "OtherViewController.h"
@interface OtherViewController ()
@end
@implementation OtherViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view._labelOne = [[UITextField alloc]initWithFrame:CGRectMake(160, 200, 70, 44)];
_labelOne.backgroundColor = [UIColor grayColor];
// _labelOne.text = @"21312";
[self.view addSubview:_labelOne];UIButton *buttonOne = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[buttonOne setTitle:@"传递" forState:UIControlStateNormal];
buttonOne.frame = CGRectMake(160,100, 70, 44);
[self.view addSubview:buttonOne];
[buttonOne addTarget:self action:@selector(delegateM) forControlEvents:UIControlEventTouchUpInside];
}- (void)delegateM
{
[_delegate OtherViewLabel:_labelOne];[self.navigationController popViewControllerAnimated:YES];
}- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
下面是Block 传值 实现相同的功能
MainViewController
#import <UIKit/UIKit.h>@interface MainViewController : UIViewController
@property (nonatomic, retain) UITextField *labelTwo;@end
#import "MainViewController.h"
#import "OtherViewController.h"
@interface MainViewController ()@end
@implementation MainViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}- (void)viewDidLoad
{
[super viewDidLoad];_labelTwo = [[UITextField alloc]initWithFrame:CGRectMake(160, 200, 70, 44)];
_labelTwo.backgroundColor = [UIColor grayColor];
[self.view addSubview:_labelTwo];// Do any additional setup after loading the view.
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(160, 100, 100, 44);
[btn setTitle:@"chuan" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}- (void)btnClick
{
OtherViewController *other = [[OtherViewController alloc] init];
[other showTextFieldUsingBlock:^(UITextField *textOne) {
_labelTwo.text = textOne.text;
}];[self.navigationController pushViewController:other animated:YES];
}
第二个界面 ：OtherViewController
#import <UIKit/UIKit.h>
typedef void (^MyBlock)(UITextField *textOne);@interface OtherViewController : UIViewController
@property (nonatomic, retain)UITextField *textOne;
@property(nonatomic, strong) MyBlock block;
- (void)showTextFieldUsingBlock:(MyBlock)block;
@end#import "OtherViewController.h"
@interface OtherViewController ()
@end
@implementation OtherViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view._textOne = [[UITextField alloc]initWithFrame:CGRectMake(160, 200, 70, 44)];
_textOne.backgroundColor = [UIColor grayColor];
// _labelOne.text = @"21312";
[self.view addSubview:_textOne];UIButton *buttonOne = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[buttonOne setTitle:@"传递" forState:UIControlStateNormal];
buttonOne.frame = CGRectMake(160,100, 70, 44);
[self.view addSubview:buttonOne];
[buttonOne addTarget:self action:@selector(clickBtn) forControlEvents:UIControlEventTouchUpInside];
}- (void)showTextFieldUsingBlock:(MyBlock)block
{
self.block = block;
}- (void)clickBtn
{
if (self.block) {
self.block(_textOne);
}
[self.navigationController popViewControllerAnimated:YES];
}
两个代码就放到这里吧，希望能帮到你们