iOS开发 UI 正向传值 反向传值，Block传值
2016-01-09 16:10
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正向传值
（属性传值）将A界面的值通过属性赋值给B界面
主要分三步：
准备工作：
建立两个控制器FirstViewcontroller，SecondViewcontroller，FirstView，SecondView
在FirstView中
#import <UIKit/UIKit.h>
@interface FirstView : UIView
@property (nonatomic,strong)UITextField *tf;
@property (nonatomic,strong)UIButton *button;
@end
#import "FirstView.h"
@implementation FirstView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor yellowColor];
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame = CGRectMake(100, 180, 100, 50);
self.button.backgroundColor = [UIColor cyanColor];
[self.button setTitle:@"跳转" forState:UIControlStateNormal];
[self addSubview:self.button];
self.tf = [[UITextField alloc] initWithFrame:CGRectMake(100, 80, 100, 50)];
self.tf.borderStyle = UITextBorderStyleRoundedRect;
self.tf.backgroundColor = [UIColor greenColor];
[self addSubview:self.tf];
}
在SecondView
#import <UIKit/UIKit.h>
@interface SecondView : UIView
@property (nonatomic,strong)UIButton *button1;
@property (nonatomic,strong)UITextField *tf1;
@end
#import "SecondView.h"
@implementation SecondView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor orangeColor];
self.button1 = [UIButton buttonWithType:UIButtonTypeSystem];
self.button1.frame = CGRectMake(100, 200, 100, 50);
self.button1.backgroundColor = [UIColor cyanColor];
[self.button1 setTitle:@"返回" forState:UIControlStateNormal];
[self addSubview:self.button1];
self.tf1 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.tf1.backgroundColor = [UIColor yellowColor];
self.tf1.borderStyle = UITextBorderStyleRoundedRect;
[self addSubview:self.tf1];
}
1.在目标控制器声明属性
#import <UIKit/UIKit.h>
#import "SecondView.h"
@interface SecondViewController : UIViewController
@property (nonatomic,strong)SecondView *sv;
#pragma mark 第一步：在目标的控制器中声明属性
@property (nonatomic,assign)NSString *text;
2.在push的时候设置属性
#import "FirstViewController.h"
#import "SecondViewController.h"
@interface FirstViewController ()
@end
@implementation FirstViewController
- (void)loadView{
[super loadView];
self.fv = [[FirstView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.fv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.fv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction{
SecondViewController *svc = [[SecondViewController alloc] init];
#pragma mark 第二步：在push的时候设置属性
svc.text = self.fv.tf.text;
[self.navigationController pushViewController:svc animated:YES];
}
3.在试图加载完成后赋值
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)loadView{
[super loadView];
self.sv = [[SecondView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.sv;
}
- (void)viewDidLoad {
[super viewDidLoad];
#pragma mark 第三步：在试图加载完成后赋值
self.sv.tf1.text = self.text;
[self.sv.button1 addTarget:self action:@selector(button1Action) forControlEvents:UIControlEventTouchUpInside];
}
- (void)button1Action{
[self.navigationController popToRootViewControllerAnimated:YES];
}
反向传值
代理传值：A页面push到B页面。如果B页面的信息向回传到A页面，用代理传值，其中B定义协议和声明代理，A确认并实现代理，A作为B的代理
主要分五步：
准备工作：
建立两个控制器FirstViewcontroller，SecondViewcontroller，FirstView，SecondView
在FirstView中
#import <UIKit/UIKit.h>
@interface FirstView : UIView
@property (nonatomic,strong)UITextField *tf;
@property (nonatomic,strong)UIButton *button;
@end
#import "FirstView.h"
@implementation FirstView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor yellowColor];
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame = CGRectMake(100, 180, 100, 50);
self.button.backgroundColor = [UIColor cyanColor];
[self.button setTitle:@"跳转" forState:UIControlStateNormal];
[self addSubview:self.button];
self.tf = [[UITextField alloc] initWithFrame:CGRectMake(100, 80, 100, 50)];
self.tf.borderStyle = UITextBorderStyleRoundedRect;
self.tf.backgroundColor = [UIColor greenColor];
[self addSubview:self.tf];
}
在SecondView
#import <UIKit/UIKit.h>
@interface SecondView : UIView
@property (nonatomic,strong)UIButton *button1;
@property (nonatomic,strong)UITextField *tf1;
@end
#import "SecondView.h"
@implementation SecondView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor orangeColor];
self.button1 = [UIButton buttonWithType:UIButtonTypeSystem];
self.button1.frame = CGRectMake(100, 200, 100, 50);
self.button1.backgroundColor = [UIColor cyanColor];
[self.button1 setTitle:@"返回" forState:UIControlStateNormal];
[self addSubview:self.button1];
self.tf1 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.tf1.backgroundColor = [UIColor yellowColor];
self.tf1.borderStyle = UITextBorderStyleRoundedRect;
[self addSubview:self.tf1];
}
第一步，第二步都在在SecondViewController.h里面进行，申明协议，声明代理
#import <UIKit/UIKit.h>
#import "SecondView.h"
#pragma mark 第一步 声明协议
@protocol ValueDelegate <NSObject>
- (void)changeValue:(NSString *)value;
@end
@interface SecondViewController : UIViewController
@property (nonatomic,strong)SecondView *sv;
#pragma mark 第二步 声明代理
@property (nonatomic,assign)id<ValueDelegate>delegate;
@end
第三步在SecondViewController.m调用代理方法
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)loadView{
[super loadView];
self.sv = [[SecondView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.sv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.sv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
// Do any additional setup after loading the view.
}
- (void)buttonAction{
#pragma mark 第三步 调用代理方法
[self.delegate changeValue:self.sv.tf.text];
[self.navigationController popToRootViewControllerAnimated:YES];
}
第四步第五步在FirstViewcontroller.m里面指定代理，实现协议的方法
#import "FirstViewController.h"
#import "SecondViewController.h"
@interface FirstViewController ()<ValueDelegate>
@end
@implementation FirstViewController
- (void)loadView{
[super loadView];
self.fv = [[FirstView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.fv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.fv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction{
SecondViewController *svc = [[SecondViewController alloc] init];
#pragma mark 代理传值 第四步指定代理
svc.delegate = self;//注：切记别忘了上面的代理
[self.navigationController pushViewController:svc animated:YES];
}
#pragma mark 第五步 实现协议的方法
- (void)changeValue:(NSString *)value{
self.fv.tf.text = value;
}
Block传值
主要分三步：
准备工作：
建立两个控制器FirstViewcontroller，SecondViewcontroller，FirstView，SecondView
在FirstView中
#import <UIKit/UIKit.h>
@interface FirstView : UIView
@property (nonatomic,strong)UITextField *tf;
@property (nonatomic,strong)UIButton *button;
@end
#import "FirstView.h"
@implementation FirstView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor yellowColor];
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame = CGRectMake(100, 180, 100, 50);
self.button.backgroundColor = [UIColor cyanColor];
[self.button setTitle:@"跳转" forState:UIControlStateNormal];
[self addSubview:self.button];
self.tf = [[UITextField alloc] initWithFrame:CGRectMake(100, 80, 100, 50)];
self.tf.borderStyle = UITextBorderStyleRoundedRect;
self.tf.backgroundColor = [UIColor greenColor];
[self addSubview:self.tf];
}
在SecondView
#import <UIKit/UIKit.h>
@interface SecondView : UIView
@property (nonatomic,strong)UIButton *button1;
@property (nonatomic,strong)UITextField *tf1;
@end
#import "SecondView.h"
@implementation SecondView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor orangeColor];
self.button1 = [UIButton buttonWithType:UIButtonTypeSystem];
self.button1.frame = CGRectMake(100, 200, 100, 50);
self.button1.backgroundColor = [UIColor cyanColor];
[self.button1 setTitle:@"返回" forState:UIControlStateNormal];
[self addSubview:self.button1];
self.tf1 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.tf1.backgroundColor = [UIColor yellowColor];
self.tf1.borderStyle = UITextBorderStyleRoundedRect;
[self addSubview:self.tf1];
}
第一步：Block回传第一步 创建一个block属性
#import <UIKit/UIKit.h>
#import "SecondView.h"
#pragma mark Block回传第一步 创建一个block属性
typedef void(^valueBlock) (NSString *value);
typedef void(^loopBlock)();
@interface SecondViewController : UIViewController
@property (nonatomic,strong)SecondView *sv;
@property (nonatomic,copy)valueBlock block;//block用copy，复制到堆区
@property (nonatomic,copy)loopBlock LB;
@end
第二步： Block回传第二步 在返回的时候调用block属性
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)loadView{
[super loadView];
self.sv = [[SecondView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.sv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.sv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
//解决block的死循环
//两个充分必要条件1.对象包含一个block属性 2.这个block属性中引用了self
//解决方法：__block
//__block 是在MRC下的，ARC用__weak
//__weak SecondViewController *weakSelf = self;
__weak typeof (self) weakSelf = self;//意思和上面的一样
self.LB = ^(){
weakSelf.sv.backgroundColor = [UIColor redColor];
};
}
- (void)buttonAction{
[self.navigationController popToRootViewControllerAnimated:YES];
#pragma mark Block回传第二步 在返回的时候调用block属性
self.block(self.sv.field.text);
}
第三步:Block回传第三步 给第二个页面的block属性赋值
#import "FirstViewController.h"
#import "SecondViewController.h"
@interface FirstViewController ()
@end
@implementation FirstViewController
- (void)loadView{
[super loadView];
self.fv = [[FirstView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.fv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.fv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction{
SecondViewController *svc = [[SecondViewController alloc] init];
#pragma mark Block回传第三步 给第二个页面的block属性赋值
svc.block = ^(NSString *value){
self.fv.field.text = value;
};
[self.navigationController pushViewController:svc animated:YES];
}
（属性传值）将A界面的值通过属性赋值给B界面
主要分三步：
准备工作：
建立两个控制器FirstViewcontroller，SecondViewcontroller，FirstView，SecondView
在FirstView中
#import <UIKit/UIKit.h>
@interface FirstView : UIView
@property (nonatomic,strong)UITextField *tf;
@property (nonatomic,strong)UIButton *button;
@end
#import "FirstView.h"
@implementation FirstView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor yellowColor];
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame = CGRectMake(100, 180, 100, 50);
self.button.backgroundColor = [UIColor cyanColor];
[self.button setTitle:@"跳转" forState:UIControlStateNormal];
[self addSubview:self.button];
self.tf = [[UITextField alloc] initWithFrame:CGRectMake(100, 80, 100, 50)];
self.tf.borderStyle = UITextBorderStyleRoundedRect;
self.tf.backgroundColor = [UIColor greenColor];
[self addSubview:self.tf];
}
在SecondView
#import <UIKit/UIKit.h>
@interface SecondView : UIView
@property (nonatomic,strong)UIButton *button1;
@property (nonatomic,strong)UITextField *tf1;
@end
#import "SecondView.h"
@implementation SecondView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor orangeColor];
self.button1 = [UIButton buttonWithType:UIButtonTypeSystem];
self.button1.frame = CGRectMake(100, 200, 100, 50);
self.button1.backgroundColor = [UIColor cyanColor];
[self.button1 setTitle:@"返回" forState:UIControlStateNormal];
[self addSubview:self.button1];
self.tf1 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.tf1.backgroundColor = [UIColor yellowColor];
self.tf1.borderStyle = UITextBorderStyleRoundedRect;
[self addSubview:self.tf1];
}
1.在目标控制器声明属性
#import <UIKit/UIKit.h>
#import "SecondView.h"
@interface SecondViewController : UIViewController
@property (nonatomic,strong)SecondView *sv;
#pragma mark 第一步：在目标的控制器中声明属性
@property (nonatomic,assign)NSString *text;
2.在push的时候设置属性
#import "FirstViewController.h"
#import "SecondViewController.h"
@interface FirstViewController ()
@end
@implementation FirstViewController
- (void)loadView{
[super loadView];
self.fv = [[FirstView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.fv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.fv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction{
SecondViewController *svc = [[SecondViewController alloc] init];
#pragma mark 第二步：在push的时候设置属性
svc.text = self.fv.tf.text;
[self.navigationController pushViewController:svc animated:YES];
}
3.在试图加载完成后赋值
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)loadView{
[super loadView];
self.sv = [[SecondView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.sv;
}
- (void)viewDidLoad {
[super viewDidLoad];
#pragma mark 第三步：在试图加载完成后赋值
self.sv.tf1.text = self.text;
[self.sv.button1 addTarget:self action:@selector(button1Action) forControlEvents:UIControlEventTouchUpInside];
}
- (void)button1Action{
[self.navigationController popToRootViewControllerAnimated:YES];
}
反向传值
代理传值：A页面push到B页面。如果B页面的信息向回传到A页面，用代理传值，其中B定义协议和声明代理，A确认并实现代理，A作为B的代理
主要分五步：
准备工作：
建立两个控制器FirstViewcontroller，SecondViewcontroller，FirstView，SecondView
在FirstView中
#import <UIKit/UIKit.h>
@interface FirstView : UIView
@property (nonatomic,strong)UITextField *tf;
@property (nonatomic,strong)UIButton *button;
@end
#import "FirstView.h"
@implementation FirstView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor yellowColor];
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame = CGRectMake(100, 180, 100, 50);
self.button.backgroundColor = [UIColor cyanColor];
[self.button setTitle:@"跳转" forState:UIControlStateNormal];
[self addSubview:self.button];
self.tf = [[UITextField alloc] initWithFrame:CGRectMake(100, 80, 100, 50)];
self.tf.borderStyle = UITextBorderStyleRoundedRect;
self.tf.backgroundColor = [UIColor greenColor];
[self addSubview:self.tf];
}
在SecondView
#import <UIKit/UIKit.h>
@interface SecondView : UIView
@property (nonatomic,strong)UIButton *button1;
@property (nonatomic,strong)UITextField *tf1;
@end
#import "SecondView.h"
@implementation SecondView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor orangeColor];
self.button1 = [UIButton buttonWithType:UIButtonTypeSystem];
self.button1.frame = CGRectMake(100, 200, 100, 50);
self.button1.backgroundColor = [UIColor cyanColor];
[self.button1 setTitle:@"返回" forState:UIControlStateNormal];
[self addSubview:self.button1];
self.tf1 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.tf1.backgroundColor = [UIColor yellowColor];
self.tf1.borderStyle = UITextBorderStyleRoundedRect;
[self addSubview:self.tf1];
}
第一步，第二步都在在SecondViewController.h里面进行，申明协议，声明代理
#import <UIKit/UIKit.h>
#import "SecondView.h"
#pragma mark 第一步 声明协议
@protocol ValueDelegate <NSObject>
- (void)changeValue:(NSString *)value;
@end
@interface SecondViewController : UIViewController
@property (nonatomic,strong)SecondView *sv;
#pragma mark 第二步 声明代理
@property (nonatomic,assign)id<ValueDelegate>delegate;
@end
第三步在SecondViewController.m调用代理方法
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)loadView{
[super loadView];
self.sv = [[SecondView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.sv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.sv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
// Do any additional setup after loading the view.
}
- (void)buttonAction{
#pragma mark 第三步 调用代理方法
[self.delegate changeValue:self.sv.tf.text];
[self.navigationController popToRootViewControllerAnimated:YES];
}
第四步第五步在FirstViewcontroller.m里面指定代理，实现协议的方法
#import "FirstViewController.h"
#import "SecondViewController.h"
@interface FirstViewController ()<ValueDelegate>
@end
@implementation FirstViewController
- (void)loadView{
[super loadView];
self.fv = [[FirstView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.fv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.fv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction{
SecondViewController *svc = [[SecondViewController alloc] init];
#pragma mark 代理传值 第四步指定代理
svc.delegate = self;//注：切记别忘了上面的代理
[self.navigationController pushViewController:svc animated:YES];
}
#pragma mark 第五步 实现协议的方法
- (void)changeValue:(NSString *)value{
self.fv.tf.text = value;
}
Block传值
主要分三步：
准备工作：
建立两个控制器FirstViewcontroller，SecondViewcontroller，FirstView，SecondView
在FirstView中
#import <UIKit/UIKit.h>
@interface FirstView : UIView
@property (nonatomic,strong)UITextField *tf;
@property (nonatomic,strong)UIButton *button;
@end
#import "FirstView.h"
@implementation FirstView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor yellowColor];
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame = CGRectMake(100, 180, 100, 50);
self.button.backgroundColor = [UIColor cyanColor];
[self.button setTitle:@"跳转" forState:UIControlStateNormal];
[self addSubview:self.button];
self.tf = [[UITextField alloc] initWithFrame:CGRectMake(100, 80, 100, 50)];
self.tf.borderStyle = UITextBorderStyleRoundedRect;
self.tf.backgroundColor = [UIColor greenColor];
[self addSubview:self.tf];
}
在SecondView
#import <UIKit/UIKit.h>
@interface SecondView : UIView
@property (nonatomic,strong)UIButton *button1;
@property (nonatomic,strong)UITextField *tf1;
@end
#import "SecondView.h"
@implementation SecondView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (void)setupView{
self.backgroundColor = [UIColor orangeColor];
self.button1 = [UIButton buttonWithType:UIButtonTypeSystem];
self.button1.frame = CGRectMake(100, 200, 100, 50);
self.button1.backgroundColor = [UIColor cyanColor];
[self.button1 setTitle:@"返回" forState:UIControlStateNormal];
[self addSubview:self.button1];
self.tf1 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
self.tf1.backgroundColor = [UIColor yellowColor];
self.tf1.borderStyle = UITextBorderStyleRoundedRect;
[self addSubview:self.tf1];
}
第一步：Block回传第一步 创建一个block属性
#import <UIKit/UIKit.h>
#import "SecondView.h"
#pragma mark Block回传第一步 创建一个block属性
typedef void(^valueBlock) (NSString *value);
typedef void(^loopBlock)();
@interface SecondViewController : UIViewController
@property (nonatomic,strong)SecondView *sv;
@property (nonatomic,copy)valueBlock block;//block用copy，复制到堆区
@property (nonatomic,copy)loopBlock LB;
@end
第二步： Block回传第二步 在返回的时候调用block属性
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)loadView{
[super loadView];
self.sv = [[SecondView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.sv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.sv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
//解决block的死循环
//两个充分必要条件1.对象包含一个block属性 2.这个block属性中引用了self
//解决方法：__block
//__block 是在MRC下的，ARC用__weak
//__weak SecondViewController *weakSelf = self;
__weak typeof (self) weakSelf = self;//意思和上面的一样
self.LB = ^(){
weakSelf.sv.backgroundColor = [UIColor redColor];
};
}
- (void)buttonAction{
[self.navigationController popToRootViewControllerAnimated:YES];
#pragma mark Block回传第二步 在返回的时候调用block属性
self.block(self.sv.field.text);
}
第三步:Block回传第三步 给第二个页面的block属性赋值
#import "FirstViewController.h"
#import "SecondViewController.h"
@interface FirstViewController ()
@end
@implementation FirstViewController
- (void)loadView{
[super loadView];
self.fv = [[FirstView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
self.view = self.fv;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.fv.button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction{
SecondViewController *svc = [[SecondViewController alloc] init];
#pragma mark Block回传第三步 给第二个页面的block属性赋值
svc.block = ^(NSString *value){
self.fv.field.text = value;
};
[self.navigationController pushViewController:svc animated:YES];
}
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