ios开发之启动画面及动画-白红宇

ios开发之启动画面及动画

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发布时间：2019-06-25

本文共 5543 字，大约阅读时间需要 18 分钟。

iOS设备现在有四种不同的分辨率：iPhone 320x480、iPhone4 640x960、iphone5 1136x640、iPad 768x1024。以前程序的启动画面(图片)只要准备一个 Default.png就可以了，但是现在变得复杂多了。

下面就是CocoaChina 会员做得总结

如果一个程序，既支持iPhone又支持iPad，那么它需要包含下面几个图片：

Default-Portrait.png iPad专用竖向启动画面 768x1024或者768x1004

Default-Landscape.png iPad专用横向启动画面 1024x768或者1024x748

Default-PortraitUpsideDown.png iPad专用竖向启动画面(Home按钮在屏幕上面)，可省略 768x1024或者768x1004

Default-LandscapeLeft.png iPad专用横向启动画面，可省略 1024x768或者1024x748

Default-LandscapeRight.png iPad专用横向启动画面，可省略 1024x768或者1024x748

Default.png iPhone默认启动图片，如果没有提供上面几个iPad专用启动图片，则在iPad上运行时也使用Default.png（不推荐） 320x480或者320x460

Default@2x.png iPhone4启动图片640x960或者640x920

为了在iPad上使用上述的启动画面，你还需要在info.plist中加入key: UISupportedInterfaceOrientations。同时，加入值UIInterfaceOrientationPortrait, UIInterfacOrientationPortraitUpsideDown, UIInterfaceOrientationLandscapeLeft, UIInterfaceOrientationLandscapeRight。

三、设置启动动画

在appDelegate中加载启动动画的controller，在开启动画的controller中载入首页controller，通过透明度来设置淡入和淡出。

appDelegate.h

#import 
     
      #import "Startupscreen.h"@interface AppDelegate : UIResponder 
      
        {     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 
     
      #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];}

上述代码实现了一个简单的进度启动动画，供大家参考。

转自：

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