iOS 首次启动画面，新装或更新用户可以通过它查看简介。
// // GuideViewController.h // Guide // // Created by twb on 13-9-17. // Copyright (c) 2013年 twb. All rights reserved. // #import <UIKit/UIKit.h> @interface GuideViewController : UIViewController <UIScrollViewDelegate> @property (nonatomic, strong) UIScrollView *scrollView; @property (nonatomic, strong) UIPageControl *pageControl; @property (nonatomic, strong) NSMutableArray *images; + (GuideViewController *)shareInstance; + (void)show; + (void)hide; @end
//
// GuideViewController.m
// Guide
//
// Created by twb on 13-9-17.
// Copyright (c) 2013年 twb. All rights reserved.
//
#import "GuideViewController.h"
@interface GuideViewController ()
@property (nonatomic, assign) BOOL animating;
@end
@implementation GuideViewController
+ (GuideViewController *)shareInstance
{
@synchronized(self)
{
static GuideViewController *sharedGuide = nil;
if (sharedGuide == nil)
{
sharedGuide = [[self alloc] initWithNibName:@"GuideViewController" bundle:nil];
}
return sharedGuide;
}
}
+ (void)show
{
[[GuideViewController shareInstance].scrollView setContentOffset:CGPointMake(0.0f, 0.0f)];
[[GuideViewController shareInstance] showGuide];
}
+ (void)hide
{
[[GuideViewController shareInstance] hideGuide];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = kClearColor;
// Do any additional setup after loading the view from its nib.
[self setupContent];
[self setupScrollView];
[self setupPageControl];
[self setupScrollViewContent];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)viewDidUnload
{
[self setScrollView:nil];
[self setPageControl:nil];
[super viewDidUnload];
}
#pragma mark - setup part.
- (void)setupContent
{
// These images retrieve from server. it is empty for just now.
self.images = [NSMutableArray arrayWithArray:@[@"Default.png", @"Default.png", @"Default.png", @"Default.png"]];
}
- (void)setupScrollView
{
self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, kScreenWidth, kScreenHeight - kScreenStatusBarHeight)];
self.scrollView.pagingEnabled = YES;
self.scrollView.delegate = self;
self.scrollView.backgroundColor = kClearColor;
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.showsVerticalScrollIndicator = NO;
// self.scrollView.backgroundColor = kOrangeColor;
self.scrollView.contentSize = CGSizeMake(kScreenWidth * self.images.count, kScreenHeight - kScreenStatusBarHeight);
[self.view addSubview:self.scrollView];
}
- (void)setupPageControl
{
self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0.0f, self.scrollView.frame.size.height - 30.0f, kScreenWidth, 30.0f)];
self.pageControl.hidesForSinglePage = YES;
self.pageControl.numberOfPages = self.images.count;
[self.pageControl addTarget:self action:@selector(pageChanged:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:self.pageControl];
}
- (void)setupScrollViewContent
{
for (NSInteger i = 0; i < self.images.count; i++)
{
UIImageView *iv = [[UIImageView alloc] initWithFrame:CGRectMake(i * kScreenWidth, 0.0f, self.scrollView.frame.size.width, self.scrollView.frame.size.height)];
iv.userInteractionEnabled = YES;
iv.image = kImageNamed(self.images[i]);
if (i % 2)
{
iv.backgroundColor = kLightGrayColor;
}
else
{
iv.backgroundColor = kGrayColor;
}
[self.scrollView addSubview:iv];
if (i == self.images.count - 1)
{
// the end page.
[iv addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(enter:)]];
}
}
}
#pragma mark - Common part.
- (CGRect)onScreenFrame
{
return [UIScreen mainScreen].applicationFrame;
}
- (CGRect)offScreenFrame
{
CGRect frame = [self onScreenFrame];
switch ([UIApplication sharedApplication].statusBarOrientation)
{
case UIInterfaceOrientationPortrait:
frame.origin.y = frame.size.height;
break;
case UIInterfaceOrientationPortraitUpsideDown:
frame.origin.y = -frame.size.height;
break;
case UIInterfaceOrientationLandscapeLeft:
frame.origin.x = frame.size.width;
break;
case UIInterfaceOrientationLandscapeRight:
frame.origin.x = -frame.size.width;
break;
}
return frame;
}
- (UIWindow *)mainWindow
{
UIApplication *app = [UIApplication sharedApplication];
if ([app.delegate respondsToSelector:@selector(window)])
{
return [app.delegate window];
}
else
{
return [app keyWindow];
}
}
#pragma mark - Event part.
- (void)enter:(UITapGestureRecognizer *)sender
{
[self hideGuide];
self.dataManager.defaults.firstLaunch = YES;
}
- (void)showGuide
{
if (!self.animating)
{
[GuideViewController shareInstance].view.frame = [self offScreenFrame];
[[self mainWindow] addSubview:[GuideViewController shareInstance].view];
self.animating = YES;
[UIView animateWithDuration:0.25f animations:^{
[GuideViewController shareInstance].view.frame = [self onScreenFrame];
} completion:^(BOOL finished) {
self.animating = NO;
}];
}
}
- (void)hideGuide
{
if (!self.animating)
{
self.animating = YES;
[UIView animateWithDuration:0.40f animations:^{
#if 0
[GuideViewController shareInstance].view.frame = [self offScreenFrame];
#else
[GuideViewController shareInstance].view.transform = CGAffineTransformMakeScale(1.25f, 1.25f);
[GuideViewController shareInstance].view.alpha = 0.0f;
#endif
} completion:^(BOOL finished) {
[[GuideViewController shareInstance].view removeFromSuperview];
self.animating = NO;
}];
}
}
- (void)pageChanged:(UIPageControl *)sender
{
NSInteger page = sender.currentPage;
[self.scrollView setContentOffset:CGPointMake(page * kScreenWidth, 0.0f) animated:YES];
}
#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
CGFloat dx = scrollView.contentOffset.x;
NSInteger page = dx / kScreenWidth;
self.pageControl.currentPage = page;
}
@end
如何使用？
在 "AppDelegate.m"文件中，
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
// ...
// Show Guide?
if (!self.dataManager.defaults.firstLaunch)
{
[GuideViewController show];
}
return YES;
}