Simple way to add all TextField delegates to a UIView?

Question

Instead of manually adding each TextField delegate to the UIView, like this:

self.txtName.delegate = self;
self.txtAge.delegate = self;

Is there a quicker way of adding all TextField delegates to a UIView?

Alternatively, is there a way I can obtain the position of a TextField that has just received focus, without using UITextFieldDelegate?

Answer 1

Create an outlet collection

@property(nonatomic, strong) IBOutletCollection(UITextField) NSArray *textFields;

then loop over the textFields

for(UITextField *aTextField in self.textFields)
{
    aTextField.delegate = self;
}

There is a good post about IBOutlets on NSHipster

Answer 2

for (UIView *aView in self.view.subviews) {

    if ([aView isKindOfClass:[UITextField class]]) {

        ((UITextField *)aView).delegate = self;
    }
}

Answer 3

«Two or more: Use a for» — Edsger W. Dijkstra

[@[self.txtNames, self.txtAge] enumerateObjectsUsingBlock:^(UITextField *tf, NSUInteger idx, BOOL *stop){
    tf.delegate = self;
}];

_{Ok: not a for. But the same principle.}

---

If you want to use a for , you could use Fast Enumeration instead of block-based Enumeration.

for (UITextField *tf in @[self.txtNames, self.txtAge]) {
    tf.delegate = self;
}

Answer 4

在视图控制器头文件的末尾添加UITextFieldDelegate 。

@interface AddressesViewController : ViewController<UITextFieldDelegate>