Question

我有一个带有插座btnAdd的按钮acton，当它按下它时添加文本字段，我想在文本字段下方移动按钮动作，同样想要按下按钮BtnRemove时恢复，

 - (IBAction)btnAddTxtField:(id)sender {

    textField = [[UITextField alloc] initWithFrame:CGRectMake(76, ([txtFieldArray count] * 30), 191, 25)];
    [textField setBorderStyle:UITextBorderStyleLine];
    textField.font = [UIFont systemFontOfSize:20];
    textField.placeholder = @"Enter text";
    textField.autocorrectionType = UITextAutocorrectionTypeNo;
    textField.keyboardType = UIKeyboardTypeDefault;
    textField.returnKeyType = UIReturnKeyDone;
    textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    textField.delegate = self;
    [myScrollview addSubview:textField];
    [txtFieldArray addObject:textField];


    CGRect frame = bottomView.frame;
    frame.origin.y += textField.frame.size.height + 5;

    btnAdd = [[UIButton alloc] initWithFrame:CGRectMake(210, ([txtFieldArray count] *30), 20, 20)];
   frame.origin.y += btnAdd.frame.size.height +5;
    bottomView.frame = frame;
    textField.hidden = NO;

}

Answer 1

修改frame变量后，将其设置为动画块中的按钮：

 [UIView animateWithDuration:0.2 animations:^{
     [btnAdd setFrame:frame];
 } 
 completion:^(BOOL finished){
      //Do something on completion if you want
 }];

显然，您可以将动画持续时间（0.2）更改为您想要的任何内容。要反转它，请执行相同操作，设置frame CGRect的origin.y，并将其设置为上面动画块中的按钮。

Answer 2

[UIView animateWithDuration: delay: options: animations: completion:];

将是您的选择。您可以查看文档here。

如何沿y轴向下移动按钮动作iphone

2 个答案: