Ui_block Pass Value

Block Pass Value

Declare block inside the second controller

// 类似代理的协议typedefvoid(^TransmitValueBlock) (NSString *);@interface SecondViewController : UIViewController// 类似代理的定义@property (nonatomic, copy) TransmitValueBlock ablock;// 可以不用写 typedef@property (nonatomicvoid (^yadongBlock) (NSString *);@end

Block body implemented in the first controller

- (void)buttonDidClicked:(UIButton *)sender{    SecondViewController *secondVC = [[SecondViewController alloc] init];    // 第一个页面实现 block 体    secondVC.ablock = ^(NSString *text){        NSLog(@"%@", text);        self.rootView.label.text = text;    };    [self.navigationController pushViewController:secondVC animated:YES];}

Second page call

- (void)leftBarButtonItemAction:(UIButton *)sender{    // 第二个页面调用,传一个参数    self.ablock(self.rootView.textfield.text);    [self.navigationController popToRootViewControllerAnimated:YES];    NSLog(@"fanhui");}

Cache data

    // 暂时存储    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"isLogin"];    // 取值    BOOL isLoginIt = [[NSUserDefaults standardUserDefaults] boolForKey:@"isLogin"];

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Ui_block Pass Value