The timer realizes the Earth revolves around the sun

One Earth revolves around the sun

1 #import "HUAppDelegate.h"2 3 #defineCenter_x 1604 #defineCenter_y 2405 #defineRADIUS 1306 7 @implementationhuappdelegate8 9-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) LaunchoptionsTen { OneSelf.window =[[UIWindow alloc] initwithframe:[[uiscreen mainscreen] bounds]; ASelf.window.backgroundColor =[Uicolor Blackcolor]; - [Self.window makekeyandvisible]; -      theUiimageview * Sun = [[Uiimageview alloc] initwithimage:[uiimage imagenamed:@"Fireball.png"]]; -Sun.bounds = CGRectMake (0,0, +, +); -Sun.center =Cgpointmake (center_x, center_y); - [Self.window Addsubview:sun]; +      -Uiimageview * earth = [[Uiimageview alloc] initwithimage:[uiimage imagenamed:@"Earth.png"]]; +Earth.bounds = CGRectMake (0,0, to, to); AEarth.center = Cgpointmake (center_x + RADIUS * cos (0),1.5* center_y + RADIUS * sin (0)); atEarth.tag =Ten; - [Self.window Addsubview:earth]; -      -[Nstimer Scheduledtimerwithtimeinterval:0.01target:self selector: @selector (ratate) Userinfo:nil Repeats:yes]; -      -     returnYES; in } -  to- (void) Ratate + { -     Static intAngle =0; theAngle + +; *Uiimageview *imageview = (Uiimageview *) [Self.window Viewwithtag:Ten]; $Imageview.center = Cgpointmake (center_x + RADIUS * cos (angle * M_PI/ the), Center_y +1.5* RADIUS * sin (angle * m_pi/ the));Panax Notoginseng } -  the @end

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Upgrade: More than one Earth rotates around the sun (people with intense phobias can't keep staring, huh?) ）

The principle is the same, just add a few more "Earth"

1 #import "HUAppDelegate.h"2 3 #defineCenter_x 1604 #defineCenter_y 2405 #defineRADIUS 1206 7 @implementationhuappdelegate8 9-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) LaunchoptionsTen { OneSelf.window =[[UIWindow alloc] initwithframe:[[uiscreen mainscreen] bounds]; ASelf.window.backgroundColor =[Uicolor Blackcolor]; - [Self.window makekeyandvisible]; -      theUiimageview * Sun = [[Uiimageview alloc] initwithimage:[uiimage imagenamed:@"Fireball"]]; -Sun.center =Cgpointmake (center_x, center_y); -Sun.bounds = CGRectMake (0,0, -, -); - [Self.window Addsubview:sun]; +      -_eartharray =[[Nsmutablearray alloc] init]; +      for(inti =0; I < A; i + +)//There are 12 simultaneous rotations of the Earth . A     { atUiimageview *earth = [[Uiimageview alloc] initwithimage:[uiimage imagenamed:@"Earth"]]; -         intAngle = -*i; -         floatHudu = angle * M_PI/ the; -Earth.center = Cgpointmake (center_x + RADIUS * cos (hudu), center_y +1.5* RADIUS *sin (hudu)); -Earth.bounds = CGRectMake (0,0, *, *); - [Self.window Addsubview:earth]; in [_eartharray Addobject:earth]; -     } to      +[Nstimer Scheduledtimerwithtimeinterval:0.01target:self selector: @selector (rotate) userinfo:nil repeats:yes]; -   the     returnYES; * } $ Panax Notoginseng- (void) Rotate - { the     Static intCount =0; +Count + +; A      for(inti =0; I < A; i + +) the     { +Uiimageview *earth = [_eartharray objectatindex:i];//get the starting angle of the current Earth and get its starting angle again -         intAngle = -* i + count;//get the starting angle of the current Earth and start moving $         floatHudu = angle * M_PI/ the; $Earth.center = Cgpointmake (center_x + RADIUS * cos (hudu), center_y +1.5* RADIUS *sin (hudu)); -     } -  the } - Wuyi @end

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You can also customize a class that inherits from Uiimageview, adding a property that records its current angle

@property int angle;

Then in the Rotate method, no static variables are needed to change the current angle of the Earth.

-(void) rotate{    for (int0 ; i < _eartharray.count; i + + )    {         *earth = [_eartharray objectatindex:i];         1 ;         float  the ;         1.5 * RADIUS * sin (hudu));}    }

The timer realizes the Earth revolves around the sun