【非凡程序员】UIScrollView、UIPageControl的练习
代码功能，实现图的自动播放~
.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UIScrollViewDelegate>
@property(nonatomic,strong)UIImageView *imageView;
@property(nonatomic,strong)UIScrollView *scrollView;
@property(nonatomic,strong)UIPageControl *PageControl;
@property(nonatomic,strong)NSTimer *timer;
@end
.m
#import "ViewController.h"
@interfaceViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[superviewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_timer=[NSTimer scheduledTimerWithTimeInterval:2.0ftarget:selfselector:@selector(autoBegin) userInfo:nilrepeats:nil];
_scrollView=[[UIScrollViewalloc]initWithFrame:CGRectMake(32.5, 100, 300,300)];
for (int i=0; i<8; i++) {
_imageView=[[UIImageViewalloc]initWithFrame:CGRectMake(i*300, 0, 300,300)];
NSString *str=[NSStringstringWithFormat:@"%i.jpg",i+1];
_imageView.image=[UIImageimageNamed:str];
[_scrollViewaddSubview:_imageView];
}
_scrollView.contentSize=CGSizeMake( _scrollView.frame.size.width * 8 , 0);
_PageControl=[[UIPageControlalloc]initWithFrame:CGRectMake(32.5, 330, 300, 100)];
_PageControl.currentPage=0;
_PageControl.numberOfPages=8;
_PageControl.currentPageIndicatorTintColor=[UIColorblueColor];
_PageControl.pageIndicatorTintColor=[UIColorblackColor];
_scrollView.delegate=self;
[self.viewaddSubview:_PageControl];
[self.viewaddSubview:_scrollView];
[self.viewbringSubviewToFront:_PageControl];
_scrollView.pagingEnabled = YES;
}
- (void)didReceiveMemoryWarning {
[superdidReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return_imageView;
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat FloatX= _scrollView.contentOffset.x;
_PageControl.currentPage = FloatX / _scrollView.frame.size.width;
}
-(void)autoBegin
{
[UIViewanimateWithDuration:1.0fanimations:^{
CGFloat offsetX = _scrollView.contentOffset.x;
offsetX += 300;
if( offsetX == _scrollView.contentSize.width ){
offsetX = 0;
}
_scrollView.contentOffset = CGPointMake( offsetX, 0);
}];
_timer=[NSTimer scheduledTimerWithTimeInterval:2.0ftarget:selfselector:@selector(autoBegin) userInfo:nilrepeats:nil];
}