Question

在我的应用程序中，我需要使用很多文本字段，我真的不希望每个viewcontroller类都包含可能很乱的文本字段的委托，我只是想创建一个通用类来处理它textfields的委托，并返回一个文本字段，我可以将其作为子视图添加到我需要的地方。我希望将它作为一个库，并在需要文本字段时调用该类例如

CustomTexTField *textField = [[CustomTextField alloc] initWithFrame:Frame];
// returns  a textField whose delegate will be set to CustomTextField //
// all i should do is just adding it as a subView //
[self.view addSubView:textField];

这可能吗？在此先感谢!!

Answer 1

作为Midhun回答你需要创建一个自定义TextField类，并在该类中设置委托。喜欢这个

.h FIle

@interface CustomTextField : UITextField<UITextFieldDelegate>
@end

.m文件

@implementation CustomTextField
- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        self.delegate = self;
    }
return self;
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField{
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
    return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField{
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    return YES;
}
- (BOOL)textFieldShouldClear:(UITextField *)textField{
    return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    return YES;
}
@end

Answer 2

创建UITextField的子类并使用它。

@interface CustomTexTField : UITextField
@end

@implementation CustomTexTField

//Add the stuffs here

@end

只要您需要文本字段，您就可以使用：

CustomTexTField *textField = [[CustomTextField alloc] initWithFrame:customFrame];
[self.view addSubView:textField];

Answer 3

您可以使用块更好的方法实现这一目标：

class MyTextField: UITextField, UITextFieldDelegate {


//MARK:- PROPERTIES

var shouldPreventAllActions:Bool = false

var canCut:Bool = true
var canCopy:Bool = true
var canPaste:Bool = true
var canSelect:Bool = true
var canSelectAll:Bool = true

var blockTextFieldShouldChangeCharactersInRangeWithReplacementString:((_ textField: UITextField, _ range: NSRange, _ string: String) -> Bool)?
var blockTextFieldShouldReturn:((_ textField: UITextField) -> Bool)?
var blockTextFieldShouldClear:((_ textField: UITextField) -> Bool)?
//MARK:-
var blockTextFieldShouldBeginEditing:((_ textField: UITextField) -> Bool)?
var blockTextFieldShouldEndEditing:((_ textField: UITextField) -> Bool)?
//MARK:-
var blockTextFieldDidBeginEditing:((_ textField: UITextField) -> Void)?
var blockTextFieldDidEndEditing:((_ textField: UITextField) -> Void)?
var blockTextFieldDidEndEditingWithReason:((_ textField: UITextField, _ reason: UITextFieldDidEndEditingReason) -> Void)?


//MARK:- INIT
override init(frame: CGRect) {
    super.init(frame: frame)
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

override func awakeFromNib() {
    super.awakeFromNib()
    commonInit()
}

private func commonInit(){
    // common initialization code..
}

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

    if(self.shouldPreventAllActions){
        return false
    }

    switch action {
    case #selector(UIResponderStandardEditActions.cut(_:)):
        return self.canCut ? super.canPerformAction(action, withSender: sender) : self.canCut
    case #selector(UIResponderStandardEditActions.copy(_:)):
        return self.canCopy ? super.canPerformAction(action, withSender: sender) : self.canCopy
    case #selector(UIResponderStandardEditActions.paste(_:)):
        return self.canPaste ? super.canPerformAction(action, withSender: sender) : self.canPaste
    case #selector(UIResponderStandardEditActions.select(_:)):
        return self.canSelect ? super.canPerformAction(action, withSender: sender) : self.canSelect
    case #selector(UIResponderStandardEditActions.selectAll(_:)):
        return self.canSelectAll ? super.canPerformAction(action, withSender: sender) : self.canSelectAll
    default:
        return super.canPerformAction(action, withSender: sender)
    }
}

//MARK:- DELEGATE

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    if(self.blockTextFieldShouldChangeCharactersInRangeWithReplacementString != nil){
        return self.blockTextFieldShouldChangeCharactersInRangeWithReplacementString!(textField,range,string)
    }else{
        return true
    }
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {

    if(self.blockTextFieldShouldReturn != nil){
        return self.blockTextFieldShouldReturn!(textField)
    }else{
        return true
    }
}
func textFieldShouldClear(_ textField: UITextField) -> Bool {

    if(self.blockTextFieldShouldClear != nil){
        return self.blockTextFieldShouldClear!(textField)
    }else{
        return true
    }
}


//MARK:-
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {

    if(self.blockTextFieldShouldBeginEditing != nil){
        return self.blockTextFieldShouldBeginEditing!(textField)
    }else{
        return true
    }
}
func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {

    if(self.blockTextFieldShouldEndEditing != nil){
        return self.blockTextFieldShouldEndEditing!(textField)
    }else{
        return true
    }
}

//MARK:-
func textFieldDidBeginEditing(_ textField: UITextField) {

    if(self.blockTextFieldDidBeginEditing != nil){
        self.blockTextFieldDidBeginEditing!(textField)
    }
}
func textFieldDidEndEditing(_ textField: UITextField) {

    if(self.blockTextFieldDidEndEditing != nil){
        self.blockTextFieldDidEndEditing!(textField)
    }
}
func textFieldDidEndEditing(_ textField: UITextField, reason: UITextFieldDidEndEditingReason) {

    if(self.blockTextFieldDidEndEditingWithReason != nil){
        self.blockTextFieldDidEndEditingWithReason!(textField,reason)
    }
}

}

Answer 4

这对我有帮助

@interface CustomTextField : UITextField <UITextFieldDelegate> 

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.delegate = self;
    }
return self;
}

将委托添加到customTextField类，它对我有用。

谢谢！

如何编写自定义UItextField类

4 个答案: