UI总结-UIPageControl
UIPageControl是继承与UIControl的一种控件:
#import "ViewController.h"
#define WIDTH self.view.frame.size.width
@interface ViewController ()
@property(nonatomic, retain)UIScrollView *scr;
@property(nonatomic, retain)UIPageControl *page;
@property(nonatomic, retain)UILabel *label;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor whiteColor];
self.scr = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 400)];
self.scr.backgroundColor = [UIColor grayColor];
[self.view addSubview:self.scr];
[_scr release];
self.scr.pagingEnabled = YES;
self.scr.bounces = NO;
self.scr.showsHorizontalScrollIndicator = NO;
self.scr.contentSize = CGSizeMake(WIDTH * 9 ,400);
UIImageView *imagev = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 400)];
imagev.image = [UIImage imageNamed:@"h6.jpeg"];
[self.scr addSubview:imagev];
[imagev release];
for (NSInteger i = 0; i < 7; i++ ) {
UIImageView *imagev = [[UIImageView alloc]initWithFrame:CGRectMake(WIDTH * (i + 1), 0, WIDTH, 400)];
imagev.image = [UIImage imageNamed:[NSString stringWithFormat:@"h%ld.jpeg", i ]];
[self.scr addSubview:imagev];
[imagev release];
}
UIImageView *imagev1 = [[UIImageView alloc]initWithFrame:CGRectMake(WIDTH * 8, 0, self.view.frame.size.width, 400)];
imagev1.image = [UIImage imageNamed:@"h0.jpeg"];
[self.scr addSubview:imagev1];
[imagev1 release];
self.scr.contentOffset = CGPointMake(WIDTH , 0);
self.scr.delegate = self;
//UIPageControl是继承与UIControl的一种控件
self.page = [[UIPageControl alloc]initWithFrame:CGRectMake(WIDTH - 200, 360, 200, 40)];
self.page.backgroundColor = [UIColor clearColor];
[self.view addSubview:self.page];
[_page release];
//总共有几个page点
self.page.numberOfPages = 7;
//每个page点的颜色
self.page.pageIndicatorTintColor = [UIColor redColor];
//当前page点的颜色
self.page.currentPageIndicatorTintColor = [UIColor blueColor];
[self.page addTarget:self action:@selector(pageChange:) forControlEvents:UIControlEventValueChanged];
self.label = [[UILabel alloc]initWithFrame:CGRectMake(0, 360, 100, 40)];
[self.view addSubview:self.label];
self.label.backgroundColor = [UIColor clearColor];
[_label release];
self.label.textAlignment = 1;
self.label.text = @"1/7";
self.label.font = [UIFont systemFontOfSize:20];
self.label.textColor = [UIColor redColor];
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
if (self.scr.contentOffset.x == 0) {
self.scr.contentOffset = CGPointMake(WIDTH * 7 , 0);
}else if (self.scr.contentOffset.x == WIDTH * 8){
self.scr.contentOffset = CGPointMake(WIDTH, 0);
}
self.page.currentPage = scrollView.contentOffset.x / WIDTH - 1;
self.label.text = [NSString stringWithFormat:@"%ld/7",self.page.currentPage + 1];
}
//pageControl 的点击事件,它可以通过作用的点击来实现currentPage值得变化(点击左边变小,点击右边变大)
-(void)pageChange:(UIPageControl *)page{
self.scr.contentOffset = CGPointMake(WIDTH * (page.currentPage + 1) , 0);
self.label.text = [NSString stringWithFormat:@"%ld/7",page.currentPage + 1];
}
运行结果如下:
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