View custom rotation animation similar to Baidu music

@ Interface firstviewcontroller ()

@ Property (nonatomic, assign) bool isplay;

@ End

@ Implementation firstviewcontroller

@ Synthesize isplay;

-(Void) viewdidload

{

[Superviewdidload];

Isplay = no;

// Rounded corner

Self. imgview. layer. cornerradius = 150.0/2.0;

Self. imgview. layer. maskstobounds = yes;

// Add an animation

Cabasicanimation * monkeyanimation = [cabasicanimationanimationwithkeypath: @ "transform. Rotation. Z"];

Monkeyanimation. tovalue = [nsnumbernumberwithfloat: 2.0 * m_pi];

Monkeyanimation. Duration = 1.5f;

Monkeyanimation. timingfunction = [camediatimingfunctionfunctionwithname: kcamediatimingfunctionlinear];

Monkeyanimation. Cumulative = no;

Monkeyanimation. removedoncompletion = no; // No remove

Monkeyanimation. repeatcount = flt_max;

[Self. imgview. layeraddanimation: monkeyanimation forkey: @ "animatedkey"];

[Self. imgviewstopanimating];

// Load the animation but do not play the animation

Self. imgview. layer. speed = 0.2;

}

-(Void) didreceivememorywarning

{

[Superdidreceivememorywarning];

// Dispose of any resources that can be recreated.

}

// Start the animation

-(Ibaction) startanimate :( ID) sender {

If (! Isplay ){

Isplay = yes;

Self. imgview. layer. speed = 1.0;

Self. imgview. layer. begintime = 0.0;

Cftimeinterval pausedtime = [self. imgview. layertimeoffset];

Cftimeinterval timesincepause = [self. imgview. layerconverttime: cacurrentmediatime () fromlayer: Nil]-pausedtime;

Self. imgview. layer. begintime = timesincepause;

}

}

// Stop the animation and save the current angle

-(Ibaction) stioanimate :( ID) sender {

If (isplay ){

Isplay = no;

Cftimeinterval pausedtime = [self. imgview. layerconverttime: cacurrentmediatime () fromlayer: Nil];

Self. imgview. layer. speed = 0.0;

Self. imgview. layer. timeoffset = pausedtime;

}

}

@ End