Question

我正在使用zBar SDK，一旦qr代码检测到委托将运行，在此委托中我定义了myView并将其用作相机上的叠加层，其中包含有关该qr代码的信息。在myView里面有一个调用方法的按钮（testAction）但是在这个方法中我无法访问我在委托中定义的任何对象，如何在testAction里面访问myView和对象？

- (void) imagePickerController: (UIImagePickerController*) reader
 didFinishPickingMediaWithInfo: (NSDictionary*) info
{

    UIView *myView;
    CGRect frame= CGRectMake(0, 0, 320, 428);
    myView=[[UIView alloc] initWithFrame:frame];
    myView.backgroundColor=[UIColor greenColor];
    myView.alpha=0.7;


    CGRect labelFrame = CGRectMake( 0, 0, 500, 30 );
    UILabel* myLabel = [[UILabel alloc] initWithFrame: labelFrame];

    [myLabel setTextColor: [UIColor orangeColor]];

     NSString *combined = [NSString stringWithFormat:@"%@%@", @"Title: ", symbol.data];
    myLabel.text=combined;


    UIButton * myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    myButton.frame = CGRectMake(10, 50, 100, 50);
    myButton.tag = 121;
    [myButton setTitle:@"Do Something" forState:UIControlStateNormal];
    [myButton setBackgroundImage:nil forState:UIControlStateNormal];
    [myButton addTarget:self action:@selector(testAction:) forControlEvents:UIControlEventTouchUpInside];

    //[button setBackgroundColor:red];



    [myView addSubview: myLabel];
    [myView addSubview: myButton];

    reader.cameraOverlayView=myView;


}

- (void)testAction: (id)sender{
    //my issue is here
}

Answer 1

制作属性。

在你的界面中有：

@property (strong, nonatomic) UIView *myView;
@property (strong, nonatomic) UILabel *myLabel;
@property (strong, nonatomic) UIButton *myButton;

在你的委托方法中：

CGRect frame= CGRectMake(0, 0, 320, 428);
self.myView=[[UIView alloc] initWithFrame:frame];
self.myView.backgroundColor=[UIColor greenColor];
self.myView.alpha=0.7;

CGRect labelFrame = CGRectMake( 0, 0, 500, 30 );
self.myLabel = [[UILabel alloc] initWithFrame: labelFrame];
self.myLabel.textColor = [UIColor orangeColor];
self.myLabel.text = [NSString stringWithFormat:@"%@%@", @"Title: ", symbol.data];

self.myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.myButton.frame = CGRectMake(10, 50, 100, 50);
self.myButton.tag = 121;
[self.myButton setTitle:@"Do Something" forState:UIControlStateNormal];
[self.myButton setBackgroundImage:nil forState:UIControlStateNormal];
[self.myButton addTarget:self action:@selector(testAction:) forControlEvents:UIControlEventTouchUpInside];

[self.myView addSubview:self.myLabel];
[self.myView addSubview:self.myButton];

reader.cameraOverlayView = self.myView;

最后在你的行动中：

- (void)testAction: (id)sender
{
    // self.myView, self.myLabel and self.myButton are all available.
}

在委托中调用方法

1 个答案: