Where are events in Cocoa Touch?
I learn Cocoa Touch several days, and today have stuck while looking for way to imp开发者_StackOverflow中文版lement a custom event. Event that I can see in Connection Inspector for my UIView subclass.
What I have: There are a UILabel and MyView:UIView on MainVindow. MyView contains a UISlider. Interfaces for Controller and MyView// Controller.h
@interface Controller : NSObject {
IBOutlet UILabel *label;
IBOutlet MyView *myView;
}
// I suppose that there should be something like -(IBAction) changeLabelValue for myView event
@end
// MyView.h
@interface MyView : UIView {
IBOutlet UISlider *slider;
float value;
}
- (IBAction) changeValue; //for slider "Changed Value" event
What I want:
Add something in MyView that allows it to rise a event after change value. Can anybody help me? My main area in programming is .NET and I begin think that its terminology is not appropriate for this case.Thanks.
I don’t know if I'm understanding you correctly but I think what you want is responding to user events from interface components. In Cocoa the term "event" is only used for objects that describe the actual event, like a touch down or key up.
To respond to higher level events, like dragging a slider or pushing a button, Cocoa uses the target action paradigm. You set up a UI component (a UIControl
derived view class) to send a given message to a given target whenever the component detects a change of its state.
To set the target and the action method you can use Interface Builder or the UIControl
method addTarget:action:forControlEvents:
.
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