Question

我有一个Temp类，它存储了很多UITextField。我使用另一个类EditViewController来显示这些UITextField，我想在EditViewController类中调用UITextField委托。那我怎么能实现这个呢？

我已经尝试过以下代码而没有运气。

ViewController *viewConnection = [self.storyboard instantiateViewControllerWithIdentifier:@"EditViewController"];

tfQue = [[UITextField alloc] initWithFrame:CGRectMake(5, 10, viewLoc.frame.size.width - 90, 25)];
tfQue.placeholder = @"tap here to type description for date";
tfQue.layer.borderWidth = 0;
tfQue.textColor = [UIColor blueColor];
tfQue.tag = tag;
tfQue.delegate = viewConnection;

上面的代码是在Temp类的函数中编写的。下面是在EditViewController中访问此函数的代码：

newElement = [tempObj createTextfieldWithQuestion:strQuestionText withOriginY:posY withIndexTag:i + 1];
[self.view addSubview:newElement];

Answer 1

传递自引用将其指定为TextField Delegate。

- (UIView *)createTextfieldWithQuestion:(NSString *)strQuestionText withOriginY:(NSInteger)posY withIndexTag:(NSInteger)indexTag setDelegateForUITextField:(id)delegateParent {
tfQue = [[UITextField alloc] initWithFrame:CGRectMake(5, 10, viewLoc.frame.size.width - 90, 25)];
tfQue.placeholder = @"tap here to type description for date";
tfQue.layer.borderWidth = 0;
tfQue.textColor = [UIColor blueColor];
tfQue.tag = tag;
tfQue.delegate = delegateParent;
}

致电

[tempObj createTextfieldWithQuestion:strQuestionText withOriginY:posY withIndexTag:i + 1 setDelegateForUITextField:self];

Answer 2

我已经解决了这个问题。以下是解决方案。

     -(UIView*)createTextfieldWithQuestion: (NSString *)text withOriginY: (CGFloat)posY withIndexTag: (int)tag withTarget:(ViewController *)vc
        {
        UIView *viewLoc = [[UIView alloc] initWithFrame:CGRectMake(5, posY, SCREEN_WIDTH - 10,   TF_VIEW_HEIGHT)];
        viewLoc.backgroundColor = [UIColor whiteColor];

        tfQue = [[UITextField alloc] initWithFrame:CGRectMake(5, 10, viewLoc.frame.size.width - 90, 25)];
        tfQue.placeholder = @"tap here to type description for date";
        tfQue.layer.borderWidth = 0;
        tfQue.textColor = [UIColor blueColor];
        tfQue.tag = tag;
        tfQue.delegate = vc;
        ...
        ...
        [viewLoc addSubview:tfQue];

        return viewLoc;
       }

上面的代码是在Temp类的函数中编写的。下面是在EditViewController中访问此函数的代码：

newObj = [tFunc createTextfieldWithQuestion:strQuestionText withOriginY:posY withIndexTag:i + 1 withTarget:self];
[self.view addSubview:newElement];

如何在不同的Objective-C类中调用UITextField委托方法？

2 个答案: