创建要显示的图片名称数组, 在RootViewController里调用, 就是盖了一层View, 主界面的逻辑该怎么写还是怎么写,代码比较简单..就是以后图个方便, 如果用tabBarController作为根控制器, 把这个方法放到
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSArray *imageNames = @[@"welcome1", @"welcome2", @"welcome3",@"welcome4",@"welcome5"];
[YFLeadPageView leadPageViewWithImageNames:imageNames];
}
做了版本控制, 一个版本只会显示一次. pageControl, 在页面滑动一半时候跳过去, 如果传入的图片名称取不到对应的UIImage, 会被过滤掉.
YFLeadPageView.gif
.h 代码
#import <UIKit/UIKit.h>
@interface YFLeadPageView : UIView
/**
初始化方法
@param imageNames 滚动显示的图片名称数组
*/
+ (void)leadPageViewWithImageNames:(NSArray *)imageNames;
@end
.m 文件代码
#import "YFLeadPageView.h"
#define kScreenWidth ([UIScreen mainScreen].bounds.size.width)
#define kScreenHeight ([UIScreen mainScreen].bounds.size.height)
@interface YFLeadPageView () <UIScrollViewDelegate>
/** 滚动图片的`ScrollView` */
@property (nonatomic, strong) UIScrollView *mainScrollView;
/** 底部 `pageControl` */
@property (nonatomic, strong) UIPageControl *pageControl;
/** `跳过` 按钮 */
@property (nonatomic, strong) UIButton *skipBtn;
/** 存放图片名称是数组 */
@property (nonatomic, strong) NSMutableArray <NSString *> *imageNames;
/** 存放images数组 */
@property (nonatomic, strong) NSMutableArray <UIImage *> *images;
/** 立即体验 按钮 */
@property (nonatomic, strong) UIButton *entryBtn;
@end
@implementation YFLeadPageView
- (instancetype)initWithFrame:(CGRect)frame imageNames:(NSArray *)imageNames {
NSAssert(imageNames, @"imageNames can not be nil.");
if (self = [super initWithFrame:frame]) {
self.imageNames = [NSMutableArray arrayWithArray:imageNames];
/** 处理传进来的imageNames */
[self checkImageNames];
[self addSubview:self.mainScrollView];
/** 跳过按钮 */
[self addSubview:self.skipBtn];
[self addSubview:self.pageControl];
[self configScrollViewImages];
}
return self;
}
/**
检查传入imageNames, 如果通过名称找不到图片, 移除.
*/
- (void)checkImageNames {
self.images = [NSMutableArray array];
for (NSString *imageName in self.imageNames) {
UIImage *image = [UIImage imageNamed:imageName];
if (image) {
[self.images addObject:image];
}
}
}
/** 传入图片名称数组 */
+ (void)leadPageViewWithImageNames:(NSArray *)imageNames {
NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
/* 当前app版本 */
NSString *currentVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
/* 本地app版本 */
NSString *localVersion = [[NSUserDefaults standardUserDefaults] stringForKey:@"currentVersion"];
if (![currentVersion isEqualToString:localVersion]) {
YFLeadPageView *leadPage = [[self alloc] initWithFrame:[UIScreen mainScreen].bounds imageNames:imageNames];
UIWindow *keyWindow = [[[UIApplication sharedApplication] delegate] window];;
[keyWindow addSubview:leadPage];
[[NSUserDefaults standardUserDefaults] setObject:currentVersion forKey:@"currentVersion"];
}
}
- (void)configScrollViewImages {
NSAssert(self.images.count, @"self.images is empty, check imageNames.");
_mainScrollView.contentSize = CGSizeMake(self.images.count * self.width, self.height);
for (int i = 0; i < self.images.count; ++i) {
UIImage *image = self.images[i];
UIImageView *imageV = [[UIImageView alloc] initWithImage:image];
imageV.frame = CGRectMake(i * self.width, 0, self.width, self.height);
[self.mainScrollView addSubview:imageV];
}
/** 立即体验 */
[self.mainScrollView addSubview:self.entryBtn];
}
- (CGFloat)height {
return self.frame.size.height;
}
- (CGFloat)width {
return self.frame.size.width;
}
#pragma mark - /**************** scrollView delegate ****************/
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
NSInteger currentIndex = scrollView.contentOffset.x / kScreenWidth;
BOOL isHidden = (self.images.count-1 == currentIndex);
self.entryBtn.hidden = !isHidden;
}
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
[self scrollViewDidEndDecelerating:scrollView];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat offsetX = scrollView.contentOffset.x;
NSInteger currentIndex = (offsetX + kScreenWidth/2) / kScreenWidth;
self.pageControl.currentPage = currentIndex;
/** scrollView 向左拖动大于100, 进入首页 */
if (scrollView.contentOffset.x > kScreenWidth * (self.images.count-1)+100) {
[self disMissLeadPage];
}
}
#pragma mark - /**************** lazy load ****************/
- (UIScrollView *)mainScrollView {
if (_mainScrollView == nil) {
_mainScrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
_mainScrollView.contentInset = UIEdgeInsetsZero;
_mainScrollView.delegate = self;
_mainScrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
_mainScrollView.backgroundColor = [UIColor cyanColor];
_mainScrollView.showsHorizontalScrollIndicator = NO;
_mainScrollView.showsVerticalScrollIndicator = NO;
_mainScrollView.pagingEnabled = YES;
//_mainScrollView.bounces = NO;
}
return _mainScrollView;
}
- (UIPageControl *)pageControl {
if (_pageControl == nil) {
_pageControl = [[UIPageControl alloc] init];
_pageControl.frame = CGRectMake((kScreenWidth-100)/2, kScreenHeight-100, 100, 20);
_pageControl.numberOfPages = self.images.count;
_pageControl.currentPage = 0;
_pageControl.currentPageIndicatorTintColor = [UIColor colorWithRed:253.0f/255 green:208.0f/255 blue:0 alpha:1.0f];
_pageControl.pageIndicatorTintColor = [UIColor grayColor];
}
return _pageControl;
}
- (UIButton *)skipBtn {
if (_skipBtn == nil) {
_skipBtn = [UIButton buttonWithType:UIButtonTypeCustom];
_skipBtn.frame = CGRectMake(kScreenWidth-100, kScreenHeight-120, 60, 30);
_skipBtn.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.8f];
_skipBtn.layer.cornerRadius = 15;
_skipBtn.layer.masksToBounds = YES;
[_skipBtn setTitle:@"跳过" forState:UIControlStateNormal];
_skipBtn.titleLabel.font = [UIFont systemFontOfSize:16];
[_skipBtn addTarget:self action:@selector(disMissLeadPage) forControlEvents:UIControlEventTouchUpInside];
}
return _skipBtn;
}
- (UIButton *)entryBtn {
if (_entryBtn == nil) {
_entryBtn = [UIButton buttonWithType:UIButtonTypeCustom];
_entryBtn.frame = CGRectMake(kScreenWidth/2-48 + (self.images.count-1) * self.width, kScreenHeight-150, 96, 36);
[_entryBtn setTitle:@"立即体验" forState:UIControlStateNormal];
_entryBtn.titleLabel.font = [UIFont systemFontOfSize:16];
_entryBtn.backgroundColor = [UIColor orangeColor];
_entryBtn.layer.cornerRadius = 18;
_entryBtn.layer.masksToBounds = YES;
_entryBtn.layer.borderWidth = 1.0f;
_entryBtn.layer.borderColor = [UIColor whiteColor].CGColor;
_entryBtn.hidden = !(self.images.count == 1);
[_entryBtn addTarget:self action:@selector(disMissLeadPage) forControlEvents:UIControlEventTouchUpInside];
}
return _entryBtn;
}
/** 点击跳过后执行方法 */
- (void)disMissLeadPage {
[UIView animateWithDuration:1.3f animations:^{
self.transform = CGAffineTransformMakeScale(1.2f, 1.2f);
self.alpha = 0;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}
@end
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