IOS uses transform and cabasicanimation to implement a view to rotate around a fixed point and to animate a rotated circle as an example of a carousel

As follows

Code of Implementation

1 #import "TurntableView.h"2 //#import "TurntableLabel.h"3 4 @implementationTurntableview5 {6Uiimageview *_BGIMGV;7 cgfloat _angle;8 }9-(Instancetype) initWithFrame: (CGRect) FrameTen { OneSelf =[Super Initwithframe:frame]; A     if(self) { - [self createsubviews]; -     } the     returnSelf ; - } -  -- (void) createsubviews{ +     //Nsarray *arr = @[@ "10", @ "20", @ "40", @ "50", @ "60", @ "80", @ "100", @ "140", @ "200", @ "300", @ "400", @ "500", @ "1000", @ "2000 ", @" 10000 "]; -Nsarray *arr = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"Ten"]; +     //Background Image AUiimageview *BGIMGV = [[Uiimageview alloc]initwithframe:cgrectmake (0,0, -, -)]; atBgImgV.layer.cornerRadius = bgimgv.frame.size.width/2; -BgImgV.layer.masksToBounds =YES; -Bgimgv.center =Self.center; -Bgimgv.backgroundcolor = [Uicolor colorwithwhite:0Alpha0.5]; - [self ADDSUBVIEW:BGIMGV]; -_BGIMGV =BGIMGV; in      -     // toNsinteger i =0; +     //radius of the circle -CGFloat r = bgimgv.frame.size.width/2; the     //the angle of each fan of the turntable *CGFloat angle = m_pi/ the* the/Arr.count; $_angle =angle;Panax Notoginseng     //loop to create a number on a pie slice -      for(NSString *strincharr) { the          +UILabel *rewardmoneylabel = [UILabelNew]; ARewardmoneylabel.frame = CGRectMake (R,0, cos (angle/2) * R,2* Sin (angle/2) *R); theRewardmoneylabel.center = Cgpointmake (rewardmoneylabel.center.x,bgimgv.frame.size.height/2); +Rewardmoneylabel.textalignment =Nstextalignmentright; -         //Rewardmoneylabel.backgroundcolor = [Uicolor greencolor]; $Rewardmoneylabel.text =str; $ [BGIMGV Addsubview:rewardmoneylabel]; -          -         //Set the anchor point (in the view, which point is the center of rotation, (0,0) is the lower left corner, () is the upper-right corner, (0.5,0.5) is the center) theRewardMoneyLabel.layer.anchorPoint = Cgpointmake (0,0.5); -         //set the position of the rotationWuyiRewardMoneyLabel.layer.position =Cgpointmake (R, R); the         //Rotate -Rewardmoneylabel.transform = cgaffinetransformmakerotation (Angle *i); Wui + + ; -     } About      $     //Red Start button -UIButton *startbtn =[UIButton Buttonwithtype:uibuttontypecustom]; -Startbtn.frame = CGRectMake (0,0, -, -); -Startbtn.center =Cgpointmake (R, R); AStartbtn.backgroundcolor =[Uicolor Redcolor]; +     //Start button click event the [startbtn addtarget:self Action: @selector (startbtnaction:) forcontrolevents:uicontroleventtouchupinside]; - [self addsubview:startbtn]; $ } the //Click the Red Start button event the- (void) Startbtnaction: (uibutton*) sender{ the     //Create a base animation theCabasicanimation *animation = [cabasicanimationNew]; -     //set the properties of the animation to be changed inAnimation.keypath =@"transform.rotation.z"; the     //Animation.fromvalue = @ (_BGIMGV.LAYER.TRANSFORM.M11); the     //The value of the final property of the animation (Turn 7.5 turns) AboutAnimation.tovalue = @ (m_pi* the); the     //playback time of the animation theAnimation.duration =3; the     //animation effect slow-forward slow-out +Animation.timingfunction =[Camediatimingfunction functionwithname:kcamediatimingfunctioneaseineaseout]; -     //solve the problem of returning to the original state after the animation ends theAnimation.removedoncompletion =NO;BayiAnimation.fillmode =kcafillmodeforwards; the     //add an animation to a layer on a view BGIMGV the[_bgimgv.layer addanimation:animation Forkey:@"Rotation"]; -      -      the     //two other methods of rotation the //[UIView animatewithduration:1 animations:^{ the ////_bgimgv.transform = Cgaffinetransformrotate (_bgimgv.transform, m_pi/180 + _angle); the //    }]; - //[UIView animatewithduration:1 animations:^{ the //_bgimgv.layer.transform = catransform3drotate (_bgimgv.layer.transform, _angle, 0, 0, 1); the //    }]; the }94  the @end

Finally, a summary of the keypath values of some commonly used animation

IOS uses transform and cabasicanimation to implement a view to rotate around a fixed point and to animate a rotated circle as an example of a carousel