Using recursion to realize the effect of uiscrollview infinite scrolling

Project requirements

The effect of Uiscrollview infinite scrolling is realized by recursion.

On-Machine questions,

#import "ViewController.h"

@interface Viewcontroller () {

Uiscrollview *mainscroll;

BOOL Isfinish;

int x;

}

@end

@implementation Viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

x=0;

Isfinish = YES;

Mainscroll = [[Uiscrollview alloc]init];

Mainscroll.frame = Self.view.bounds;

Mainscroll.contentsize = Cgsizemake (self.view.bounds.size.width*8, self.view.bounds.size.height);

for (int i = 0; i < 8; i++) {

Uiimageview *imgview = [[Uiimageview alloc]initwithimage:[uiimage imagenamed:[nsstring stringWithFormat:@ '%d.jpg ', i+ 1]];

Imgview.frame = CGRectMake (self.view.bounds.size.width*i, 0, Self.view.bounds.size.width, Self.view.bounds.size.height);

[Mainscroll Addsubview:imgview];

}

[Self.view Addsubview:mainscroll];

[Self movescroll];

}

The

Start writing code, achieve eight pictures continuously scroll to the last one and then roll back to the first one in reverse order, the loop scrolling does not end.

-(void) Movescroll

{

}

End_code

-(void) didreceivememorywarning {

[Super didreceivememorywarning];

}

@end

Answer:

The

Start writing code, achieve eight pictures continuously scroll to the last one and then roll back to the first one in reverse order, the loop scrolling does not end.

-(void) movescroll{

[Nstimer scheduledtimerwithtimeinterval:0.5 target:self selector: @selector (move) Userinfo:nil Repeats:yes];

}

static int count =-1;

-(void) move

{

x = Mainscroll.contentoffset.x/self.view.bounds.size.width;

if (x = = 0 | | x = = 7) {

Count =-count;

}

x = x +count;

[Mainscroll setcontentoffset:cgpointmake (x*self.view.bounds.size.width, 0)];

}

Using recursion to realize the effect of uiscrollview infinite scrolling