iOS 代理協議傳值

標籤：

從ViewController跳轉到FirstViewController, 在FirstViewController中傳一個NSInteger值回來

ViewController.m

#import "ViewController.h"

#import "FirstViewController.h"

@interface ViewController () <PassValueDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    self.view.backgroundColor = [UIColorwhiteColor];

    _myButton = [UIButtonbuttonWithType:UIButtonTypeCustom];

   _myButton.frame =CGRectMake(20,20, 100, 100);

    [_myButtonsetTitle:@"跳轉"forState:UIControlStateNormal];

    _myButton.backgroundColor = [UIColorredColor];

    [_myButtonaddTarget:selfaction:@selector(clicked:)forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:_myButton];

}

// button點擊事件 跳轉到FirstViewController

- (void)clicked:(UIButton *)button

{

    FirstViewController *firVC = [[FirstViewControlleralloc] init];

    firVC.passDelegate =self;

    [selfpresentViewController:firVC animated:YEScompletion:nil];

}

- (void)setValue:(NSInteger )value

{

   NSLog(@"value ===== %ld", (long)value);

}

@end

FirstViewController.h

// 簽協議  以及方法（名子自己起，類型為要傳的值的類型）

@protocol PassValueDelegate <NSObject>

- (void)setValue:(NSInteger)value;

@end

@interface FirstViewController : UIViewController

// 簽代理  屬性

@property(nonatomic, assign)id<PassValueDelegate> passDelegate;

@property(nonatomic, assign)NSInteger number;

@end

FirstViewController.m

#import "FirstViewController.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    // Do any additional setup after loading the view.

    self.view.backgroundColor = [UIColorgreenColor];

    

    _myButton = [UIButtonbuttonWithType:UIButtonTypeCustom];

    _myButton.frame =CGRectMake(20,20, 100, 100);

     [_myButtonaddTarget:selfaction:@selector(clicked:)forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:_myButton];

   _number = 1000;

}

//代理遵從協議的方法

- (void)clicked:(UIButton *)button

{

    [self.passDelegatesetValue:_number];

    [self dismissViewControllerAnimated:YEScompletion:nil];

}

iOS 代理協議傳值