Implementation of IOS up and down rolling carousel

last wrote a about scrolling using scroll implementation of the Carousel, today is nothing to do a scroll up and down the font rotation, the general idea is the same.

if you want to achieve scrolling up and down the carousel, first of all to determine a few

1.scroll Visible range (scrollable range)
2.contentSize (max scrolling range)
3. There are, of course, data sources, and about scrolling similar, item+2 good, determined that these points have a way of thinking can be directly to the code declared properties

@property (Strong, Nonatomic) Uiscrollview * verticalscroll;//The parent view that hosts the data
@property (strong, nonatomic) Nsarray * titlearrays;//Data source
@property (Strong, Nonatomic) Nstimer * mytimer;//Timer Control Carousel

data source (data processed here, number +2)

-(Nsarray *) titlearrays{
    if (!_titlearrays) {
        _titlearrays = [Nsarray arraywithobjects:@ "Today is a fine day", @ " Temperatures reached more than 30 degrees ", @" but I do not feel very hot ", @" because of what ", @" the company opened air-conditioning ", @" This is not can have ah ", @" Today is a good weather ", @" Temperature reached 30 degrees above ", nil];
    }
    return _titlearrays;

}

The parent view includes the creation of the data

-(Uiscrollview *) verticalscroll{if (!_verticalscroll) {_verticalscroll = [[Uiscrollview alloc]init];
        _verticalscroll.center = Cgpointmake (SCREEN_WIDTH/2, SCREEN_HEIGHT/2);
        _verticalscroll.bounds = CGRectMake (0, 0, 130, 60);
        _verticalscroll.pagingenabled = YES;
        _verticalscroll.showsverticalscrollindicator = NO;
        _verticalscroll.scrollenabled = NO;
        _verticalscroll.bounces = NO;

        _verticalscroll.delegate = self;
        [Self.view Addsubview:_verticalscroll];
        CGFloat Scaleh = 20;
        CGFloat Height = 20;
        CGFloat H = 0; for (int i =0; i<self.titlearrays.count; i++) {UIButton * button = [UIButton Buttonwithtype:uibuttontypecu
            Stom];
            Button.frame = CGRectMake (H+scaleh, Cgrectgetwidth (_verticalscroll.frame) -20, Height);
            [Button settitle:self.titlearrays[i] forstate:uicontrolstatenormal]; [Button Settitlecolor:[uicolor Redcolor] Forstate:uicoNtrolstatenormal];
            Button.tag = i+10;


            [_verticalscroll Addsubview:button];
        H = Button.frame.origin.y+button.frame.size.height+scaleh;

    } _verticalscroll.contentsize = Cgsizemake (0, H);
return _verticalscroll; }

also a control unlimited carousel timer (I was created when entering the interface, according to the requirements of the project)

-(void) Viewwillappear: (BOOL) animated{
    self.verticalScroll.backgroundColor = [Uicolor whitecolor];

    _mytimer = [Nstimer scheduledtimerwithtimeinterval:1.5 target:self selector: @selector (changescrollcontentoffsety) Userinfo:nil Repeats:yes];
    [[Nsrunloop Currentrunloop] Addtimer:_mytimer formode:nsrunloopcommonmodes];
}

Implement Timer Method

-(void) changescrollcontentoffsety{
    //start timer
    cgpoint point = Self.verticalScroll.contentOffset;
    [Self.verticalscroll setcontentoffset:cgpointmake (0, Point.y+cgrectgetheight (self.verticalScroll.frame)) animated : YES];

of course, the rolling agent is also needed. Because this is not considered manual sliding can scroll, so write only one agent agreement, the code is as follows

-(void) Scrollviewdidendscrollinganimation: (Uiscrollview *) ScrollView
{
    NSLog (@ "Endani");
    if (Scrollview.contentoffset.y==scrollview.contentsize.height-cgrectgetheight (Self.verticalScroll.frame)) {
        [ScrollView setcontentoffset:cgpointmake (0, Cgrectgetheight (self.verticalScroll.frame))];
    }

The last timer remembers to destroy when exiting this interface

-(void) Viewwilldisappear: (BOOL) animated{
    [_mytimer invalidate];
    _mytimer = nil;
}

to this, an infinite scrolling of the upper and lower font of the carousel, is made. Of course the code words are still relatively rotten, there are insufficient places please point out that I will change in time. Last record this article is for reference only, demo address