Startup screen and animation for iPhone Development

I. Static Image settings

IOS devices have three different resolutions: iPhone 320x480, iPhone 4 640x960, and iPad 768x1024. In the past, you only needed to prepare a Default.png startup screen (image), but now it is much more complicated. The following is a summary of CocoaChina members.

If a program supports both iPhone and iPad, it must contain the following images:

Default-Portrait.png iPad dedicated vertical boot screen 768x1024 or 768x1004

Default-Landscape.png iPad dedicated landscape boot screen 1024x768 or 1024x748

Default-PortraitUpsideDown.png iPad dedicated vertical boot screen (Home button on screen), can omit 768x1024 or 768x1004

Horizontal boot screen for Default-LandscapeLeft.png iPad, omitted 1024x768 or 1024x748

Horizontal boot screen for Default-LandscapeRight.png iPad, omitted 1024x768 or 1024x748

Default.png iphone boot image. If you do not have a few ipad boot images, you can also use 320ult.png (not recommended) 320x8.0 or 320x460 at the runtime of ipad.

Default@2x.png iPhone4 boot pictures 640x960 or 640x920

 

To use the above boot screen on the iPad, you also need to add the key: UISupportedInterfaceOrientations in info. plist. In addition, the value UIInterfaceOrientationPortrait, UIInterfacOrientationPortraitUpsideDown, UIInterfaceOrientationLandscapeLeft, and UIInterfaceOrientationLandscapeRight are added.

 

2. Set the duration of the Static Image

You can use the following methods in-(BOOL) application :( UIApplication *) application didfinishlaunchingwitexceptions :( NSDictionary *) launchOptions:

1. sleep (3 );

2. [NSThread sleepForTimeInterval: 5.0];

3. [selfperformSelector: @ selector (startupview) withObject: nilafterDelay: 3];

 

3. Set the startup Animation

Load the animation controller in appDelegate, load the homepage controller in the animation-enabled controller, and set fade in and fade out through transparency.

AppDelegate. h

#import <UIKit/UIKit.h>#import "Startupscreen.h"@interface AppDelegate : UIResponder <UIApplicationDelegate> {     Startupscreen *startupscreen;}@property (strong, nonatomic) UIWindow *window;@property (nonatomic, retain) Startupscreen *startupscreen;@end

AppDelegate. m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    NSLog(@"didFinishLaunchingWithOptions");    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];    startupscreen = [[Startupscreen alloc] initWithNibName:@"Startupscreen" bundle:nil];    [self.window addSubview:startupscreen.view];    [self.window makeKeyAndVisible];    return YES;}

Startupscreen. h

#import <UIKit/UIKit.h>#import "ViewController.h"@interface Startupscreen : UIViewController{    NSTimer *timer;    UIImageView *splashImageView;    UINavigationController *nav;    ViewController *myviewcontroller;}@property (nonatomic,retain) NSTimer *timer;@property (nonatomic,retain) UIImageView *splashImageView;@property (nonatomic,retain) UINavigationController *nav;@property (nonatomic,retain) ViewController *myviewcontroller;@end

Startupscreen. m

#import "Startupscreen.h"#import "ViewController.h"@interface Startupscreen ()@end@implementation Startupscreen@synthesize timer;@synthesize splashImageView;@synthesize nav;@synthesize myviewcontroller;int flag;NSTimer *timer;- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.        CGRect appFrame = [[UIScreen mainScreen] applicationFrame];        UIView *view = [[UIView alloc] initWithFrame:appFrame];        view.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;        self.view = view;        [view release];                flag = 0;        splashImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"c618Default1.png"]];    splashImageView.frame = CGRectMake(0, 0, 768, 1004);    [self.view addSubview:splashImageView];    timer = [NSTimer scheduledTimerWithTimeInterval:0.6                                              target:self                                            selector:@selector(addLabel)                                            userInfo:nil                                             repeats:YES];        myviewcontroller = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];    myviewcontroller.view.alpha = 0.0;    //[self.view addSubview:myviewcontroller.view];    nav = [[UINavigationController alloc] init];    [nav pushViewController:myviewcontroller animated:NO];    [self.view addSubview:nav.view];            timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(fadeScreen) userInfo:nil repeats:NO];           }- (void)addLabel{        flag++;    if (flag <=5) {        UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(200+50*flag,600,40, 40)];        label1.text = @"123";        label1.font = [UIFont systemFontOfSize:23];        label1.textColor = [UIColor whiteColor];        [self.view addSubview:label1];        [label1 release];    }    }- (void)fadeScreen{    [UIView beginAnimations:nil context:nil]; // begins animation block    [UIView setAnimationDuration:0.75];        // sets animation duration    [UIView setAnimationDelegate:self];        // sets delegate for this block    [UIView setAnimationDidStopSelector:@selector(finishedFading)];   // calls the finishedFading method when the animation is done (or done fading out)        self.view.alpha = 0.0;       // Fades the alpha channel of this view to "0.0" over the animationDuration of "0.75" seconds    [UIView commitAnimations];   // commits the animation block.  This Block is done.}- (void) finishedFading{        [UIView beginAnimations:nil context:nil]; // begins animation block    [UIView setAnimationDuration:0.75];        // sets animation duration    self.view.alpha = 1.0;   // fades the view to 1.0 alpha over 0.75 seconds    myviewcontroller.view.alpha = 1.0;    [UIView commitAnimations];   // commits the animation block.  This Block is done.        for(UIView *mylabelview in [self.view subviews])    {        if ([mylabelview isKindOfClass:[UILabel class]]) {            [mylabelview removeFromSuperview];        }    }        [splashImageView removeFromSuperview];}

The above code implements a simple progress startup animation for your reference.