Basic use of attenuation animations for IOS pop animations

Fade animation

-(void) Viewdidload {

[Super Viewdidload];

[Self initcirclebtn];

}

-(void) Initcirclebtn {

Instantiate the gesture and eventually add the gesture to the circle button

Uipangesturerecognizer *pan = [[Uipangesturerecognizer alloc]initwithtarget:self Action: @selector (Handlepan:)];

Instantiate a circular button

UIButton *circlebtn = [[UIButton alloc]init];

Circlebtn.bounds = CGRectMake (0, 0, 100, 100);

Circlebtn.center = Self.view.center;

Circlebtn.backgroundcolor = [Uicolor Redcolor];

CircleBtn.layer.cornerRadius = Cgrectgetwidth (circlebtn.frame)/2;

[Circlebtn Addgesturerecognizer:pan];

[Circlebtn addtarget:self Action: @selector (Handledown:) Forcontrolevents:uicontroleventtouchdown];

[Self.view ADDSUBVIEW:CIRCLEBTN];

}

-(void) Handlepan: (Uipangesturerecognizer *) Recognizer {

Cgpoint translation = [recognizer TranslationInView:self.view];

Recognizer.view.center = Cgpointmake (recognizer.view.center.x + translation.x, Recognizer.view.center.y + TRANSLATION.Y);

[Recognizer Settranslation:cgpointmake (0, 0) InView:self.view]; //This is important because Handlepan: it will continue to be called, and the button will move very quickly if the displacement generated by the last call to the method is not zeroed .

//When you let go, start the decay animation

if (recognizer.state = = uigesturerecognizerstateended) {

Cgpoint velocity = [recognizer VelocityInView:self.view]; //Get let go when gesture in controller view speed

Popdecayanimation *popanimation = [Popdecayanimation animationwithpropertynamed:kpoplayerposition]; //Instantiate attenuation animation, which acts on position

[Popanimation Setvelocity:[nsvalue valuewithcgpoint:velocity]; //Set the initial speed of the Falloff animation

[Recognizer.view pop_addanimation:popanimation forkey:@ "Suibian"]; //Add falloff Animation to circular button

}

}

Basic use of attenuation animations for IOS pop animations