iOS纯代码制作欢迎界面——UIScrollView, UIPageControl, UIImageView,UIButton, NSTimer

　　欢迎界面，还是比较简单的，一个UIScrollView控件,一个UIPageControl,几个UIImageView即可摆平。在这里光玩这些，就显得诚意不足了。特意拓展一下，再加几个UIButton，可以让这个欢迎界面变成可点击的，可滑动的模块添加在页面中，然后再加一个NSTimer，让它自己隔2秒自己循环滑动着，立马让它变成可以放在主页用于展示主打商品的模块。

　　下面直接展示可直接运行的Demo，代码都挺简单，这次就不添加注解了。

#import "ViewController.h"

@interface ViewController ()<UIScrollViewDelegate>

@property(nonatomic,strong) UIScrollView *scrollerView;

@property(nonatomic,strong) NSArray *images;

@property(nonatomic,strong) NSMutableArray *imageButtons;

@property(nonatomic,strong) UIPageControl *pageControl;

@end

@implementation ViewController

-(NSArray *)images{

if (!_images) {

_images = @[@"1.png",@"2.png",@"3.png",@"4.png",@"5.png",@"6.png"];

}

return _images;

}

-(NSMutableArray *)imageButtons{

if (!_imageButtons) {

_imageButtons = [NSMutableArray array];

}

return _imageButtons;

}

- (void)viewDidLoad {

[super viewDidLoad];

[self initScrollerView];

}

-(void)initScrollerView{

UIScrollView *scrollerView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];

self.scrollerView = scrollerView;

scrollerView.contentSize = CGSizeMake(self.view.bounds.size.width * self.images.count, self.view.bounds.size.height);

scrollerView.pagingEnabled = YES;

scrollerView.bounces = NO;

scrollerView.delegate = self;

[self.view addSubview:scrollerView];

for (int i = 0; i<self.images.count; i++) {

UIImage *image = [UIImage imageNamed:self.images[i]];

UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

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

imageView.contentMode = UIViewContentModeScaleToFill;

[scrollerView addSubview:imageView];

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];

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

button.backgroundColor = [UIColor clearColor];

[button addTarget:self action:@selector(clickScrollerViewButton:) forControlEvents:UIControlEventTouchUpInside];

[scrollerView addSubview:button];

[self.imageButtons addObject:button];

}

UIPageControl *pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, scrollerView.bounds.size.height - 20, scrollerView.bounds.size.width, 10)];

self.pageControl = pageControl;

pageControl.numberOfPages = self.images.count;

pageControl.pageIndicatorTintColor = [UIColor lightGrayColor];

pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];

pageControl.userInteractionEnabled = NO;

[pageControl addTarget:self action:@selector(clickScrollerViewButton:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:pageControl];

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:3.0f target:self selector:@selector(changeImageByTimer) userInfo:nil repeats:YES];

[timer fireDate];

}

-(void)clickScrollerViewButton:(UIButton*)button{

NSInteger num = [self.imageButtons indexOfObject:button];

NSLog(@"%ld",(long)num);

}

-(void)changeImageByTimer{

self.pageControl.currentPage = (self.pageControl.currentPage+1)%self.images.count;

self.scrollerView.contentOffset = CGPointMake(self.pageControl.currentPage * self.view.bounds.size.width, 0);

}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

CGPoint point = scrollView.contentOffset;

NSInteger index = point.x / scrollView.frame.size.width;

self.pageControl.currentPage = index;

}

@end