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#import <UIKit/UIKit.h>

@interface Appdelegate:uiresponder <UIApplicationDelegate>

{

@public

Nsinteger TimeValue;

}

@property (Strong, nonatomic) UIWindow *window;

@end

#import "AppDelegate.h"

@interface Appdelegate ()

@end

@implementation Appdelegate

-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) launchOptions {

[UIScreen mainscreen].bounds get the screen size of the hardware device

CGRectMake (0, 0, 320, 568) Setting the screen size is not variable

Self.window=[[uiwindow Alloc]initwithframe:[uiscreen Mainscreen].bounds];

Self.window=[[uiwindow alloc]initwithframe:cgrectmake (0, 0, 320, 568-20)];//run only once

Self.window.backgroundcolor=[uicolor redcolor];//Setting the background color

[Nstimer scheduledtimerwithtimeinterval:1 target:self selector: @selector (timeraction:) Userinfo:nil Repeats:yes];

Marquee idea-"Set timer characteristics, run once per second"-"Set global variables TimeValue settings-" Two by odd even, more than one set a local variable to find the remainder. Can. or direct introduction of digital redundancy is also possible. The above and below comments are all error-based and are for training.

[Self.window makekeyandvisible]; //Let the currently generated window appear at the front end

window design, color set, before the front of the window to add things

return YES;

}

-(void) Timeraction: (Nstimer *) timer{

UIView *aview=[[uiview Alloc]initwithframe:cgrectmake (45, 45, 230, 468)];

UIView *aview1=[[uiview Alloc]initwithframe:cgrectmake (90, 90, 140, 368)];

UIView *aview2=[[uiview Alloc]initwithframe:cgrectmake (135, 135, 50, 268)];

timevalue++;

int i=3;

if (timevalue%i==0) {

Aview.backgroundcolor=[uicolor Yellowcolor];

Aview1.backgroundcolor=[uicolor Bluecolor];

Aview2.backgroundcolor=[uicolor Greencolor];

[Self.window Addsubview:aview];

[Self.window Addsubview:aview1];

[Self.window Addsubview:aview2];

}

if (timevalue%i==1) {

Aview.backgroundcolor=[uicolor Bluecolor];

Aview1.backgroundcolor=[uicolor Greencolor];

Aview2.backgroundcolor=[uicolor Yellowcolor];

[Self.window Addsubview:aview];

[Self.window Addsubview:aview1];

[Self.window Addsubview:aview2];

}

if (timevalue%i==2) {

Aview.backgroundcolor=[uicolor Greencolor];

Aview1.backgroundcolor=[uicolor Yellowcolor];

Aview2.backgroundcolor=[uicolor Bluecolor];

[Self.window Addsubview:aview];

[Self.window Addsubview:aview1];

[Self.window Addsubview:aview2];

}

}

@end

Three-color space-time Gate type marquee 1