传值展示
本文主要讲解iOS中常见的反向传值方法。
1.AppDelegate传值
- 在AppDelegate中定义相关的属性变量
- 第二个控制器中为AppDelegate中的属性赋值
- 第一个控制器中在使用的地方取出AppDelegate中的值赋值
//UIApplicationDelegate
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
//AppDelegate属性
@property (nonatomic, copy) NSString * string;
@property (nonatomic, strong) UIColor * color;
@end
//第二个控制器
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
//设置数据信息
AppDelegate * app = [UIApplication sharedApplication].delegate;
app.string = self.field.text;
app.color = [UIColor orangeColor];
[self.navigationController popViewControllerAnimated:YES];
}
//第一个控制器---设置
AppDelegate * app = [UIApplication sharedApplication].delegate;
if (app.string) {
[self.appBtn setTitle:app.string forState:UIControlStateNormal];
[self.appBtn setBackgroundColor:app.color];
}
2.代理传值
- 第二个控制器设置代理相关信息
- 第一个控制器实现代理
//第二个控制器
#import <UIKit/UIKit.h>
@protocol ZZYDelegateViewControllerDelegate <NSObject>
@optional
- (void)delegateViewControllerDidClickwithString:(NSString *)string color:(UIColor *)color;
@end
@interface ZZYDelegateViewController : UIViewController
@property (nonatomic, assign) id<ZZYDelegateViewControllerDelegate> delegate;
@end
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if ([self.delegate respondsToSelector:@selector(delegateViewControllerDidClickwithString:color:)]) {
[self.delegate delegateViewControllerDidClickwithString:self.field.text color:[UIColor greenColor]];
}
[self.navigationController popViewControllerAnimated:YES];
}
//第一个控制器
@interface ZZYRootViewController ()<ZZYDelegateViewControllerDelegate>
@property (weak, nonatomic) IBOutlet UIButton *delegateBtn;
@end
- (IBAction)pressDelegateVc:(id)sender {
ZZYDelegateViewController * vc = [[ZZYDelegateViewController alloc]init];
vc.delegate = self;
[self.navigationController pushViewController:vc animated:YES];
}
- (void)delegateViewControllerDidClickwithString:(NSString *)string color:(UIColor *)color
{
[self.delegateBtn setTitle:string forState:UIControlStateNormal];
[self.delegateBtn setBackgroundColor:color];
}
3.控制器传值
- 第一个控制器.h里面设置相关属性等信息
- 第二个控制器设置第一个控制器参数,并在对应位置设置相关信息
//第一个控制器
#import <UIKit/UIKit.h>
@interface ZZYRootViewController : UIViewController
@property (weak, nonatomic) IBOutlet UIButton *vcBtn;
@end
//第二个控制器
#import <UIKit/UIKit.h>
@class ZZYRootViewController;
@interface ZZYVCViewController : UIViewController
@property (nonatomic, strong) ZZYRootViewController * rootVc;
@end
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
[self.rootVc.vcBtn setTitle:self.field.text forState:UIControlStateNormal];
[self.rootVc.vcBtn setBackgroundColor:[UIColor orangeColor]];
[self.navigationController popViewControllerAnimated:YES];
}
4.通知传值
- 第二个控制器发送通知
- 第一个控制器接收通知，设置数据
//第二个控制器
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
[[NSNotificationCenter defaultCenter]postNotificationName:@"ZZYNotiSendValue" object:nil userInfo:@{@"value":self.field.text,@"color":[UIColor redColor]}];
[self.navigationController popViewControllerAnimated:YES];
}
//第一个控制器
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(setNoti:) name:@"ZZYNotiSendValue" object:nil];
- (void)setNoti:(NSNotification *)noti
{
[self.notiBtn setTitle:noti.userInfo[@"value"] forState:UIControlStateNormal];
[self.notiBtn setBackgroundColor:noti.userInfo[@"color"]];
}
5.Block传值
- 第二个控制器设置block相关信息
- 第一个控制器调用block，设置数据
方式一：
//第二个控制器
@interface ZZYBlockViewController : UIViewController
@property (nonatomic, copy) void(^ZZYMyBlock) (NSString * string , UIColor * color);
@end
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (self.ZZYMyBlock) {
self.ZZYMyBlock(self.field.text,[UIColor lightGrayColor]);
}
[self.navigationController popViewControllerAnimated:YES];
}
//第一个控制器
ZZYBlockViewController * vc = [[ZZYBlockViewController alloc]init];
[vc setZZYMyBlock:^(NSString * string, UIColor * color) {
[self.blockBtn setTitle:string forState:UIControlStateNormal];
[self.blockBtn setBackgroundColor:color];
}];
方式二：
//第二个控制器
typedef void(^ZZYMySecBlock) (NSString * string , UIColor * color);
@interface ZZYBlockViewController : UIViewController
@property (nonatomic, copy) ZZYMySecBlock mySecondBlock;
- (void)returnTextBlock:(ZZYMySecBlock)block;
@end
- (void)returnTextBlock:(ZZYMySecBlock)block
{
self.mySecondBlock = block;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (self.mySecondBlock) {
self.mySecondBlock(self.field.text,[UIColor lightGrayColor]);
}
[self.navigationController popViewControllerAnimated:YES];
}
//第一个控制器
ZZYBlockViewController * vc = [[ZZYBlockViewController alloc]init];
[vc returnTextBlock:^(NSString *string, UIColor *color) {
[self.blockBtn setTitle:string forState:UIControlStateNormal];
[self.blockBtn setBackgroundColor:color];
}];
3.方式三:
//第二个控制器
#import <UIKit/UIKit.h>
typedef void(^ZZYMyThrBlock) (NSString * string , UIColor * color);
@interface ZZYBlockViewController : UIViewController
@property (nonatomic, copy) ZZYMyThrBlock myThrBlock;
@end
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (self.myThrBlock) {
self.myThrBlock(self.field.text,[UIColor lightGrayColor]);
}
[self.navigationController popViewControllerAnimated:YES];
}
//第一个控制器
ZZYBlockViewController * vc = [[ZZYBlockViewController alloc]init];
vc.myThrBlock = ^(NSString * string, UIColor * color){
[self.blockBtn setTitle:string forState:UIControlStateNormal];
[self.blockBtn setBackgroundColor:color];
};
[self.navigationController pushViewController:vc animated:YES];
注:上述方式一般首选Block传值，在上述Block的三种方式中，第一种和第三种方式使用的时候需要注意补全block的信息
- 除了上述方式反向传值还可以通过单例、NSUserDefaults方式来进行传值
示例代码地址
