I know this thread is 7 months old and the OP is probably long past this question but since the feature is yet to be added to ionic framework, I'm adding the workaround I came up with for other people's reference.
CSS PART
Intuitively the first thing you need to do is to add some sass/css to hide the unwanted buttons. I did that by passing a css class "remove-ok" to selectOptions for my ion-select element. (I'm only removing OK button but if someone needs to remove cancel button as well, that's an easy css modification).
In component:
this.selectOptions = {
cssClass: 'remove-ok'
};
and in HTML:
<ion-select [selectOptions]="selectOptions">
And in app.scss add:
.remove-ok {
.alert-button:nth-child(2) {
display: none;
}
}
SCRIPT PART
Now that the OK button is hidden, you will need to somehow close the alert view.
To invoke click() event on the hidden OK button is straightforward and intuitive but you'll soon find out that although it works perfectly on ionic serve, it won't work on an actual iOS device.
The solution is to find reference to the alert view, pass the checked option to the select handler, and finally dismiss the view.
So in ngOnInit in your component class, you'll need this:
ngOnInit() {
let root = this.viewController.instance.navCtrl._app._appRoot;
document.addEventListener('click', function(event){
let btn = <HTMLLIElement> document.querySelector('.remove-ok .alert-button-default:nth-child(2)');
let target = <HTMLElement> event.target;
if(btn && target.className == 'alert-radio-label')
{
let view = root._overlayPortal._views[0];
let inputs = view.instance.d.inputs;
for(let input of inputs) {
if(input.checked) {
view.instance.d.buttons[1].handler([input.value]);
view.dismiss();
break;
}
}
}
});
}
Again, if you intend to remove the Cancel button as well, mind the css references in this code.
