苹果iOS实例编程入门教程.docx

苹果iOS实例编程入门教程.docx

《苹果iOS实例编程入门教程.docx》由会员分享，可在线阅读，更多相关《苹果iOS实例编程入门教程.docx（5页珍藏版）》请在冰豆网上搜索。

苹果iOS实例编程入门教程

苹果iOS实例编程入门教程

想给你的iPhone制作一场雪景吗?

今天小编为大家整理了苹果iOS实例编程入门教程，一起来看看吧!

纲要：

-在程序显示前运行代码-

-UIImageView的运用-

-关于iPhone的“UtilityApplication”运用-

-onTimer代码运用-

-onAnimation代码运用-

首先运行以安装好的xCode

选择:

File->NewProject.

从"NewProject"窗口

选择:

iPhoneOS->Applications->UtilityApplication

命名:

我这里命名为“SnowFall”

（1）  在xCode打开MainView.h文件,加入下面代码

#import

@interfaceMainViewController:

UIViewController{

UIImage*flakeImage;

}

@property（nonatomic,retain）UIImage*flakeImage;

-（void）onTimer;

-（void）onAnimationComplete:

（NSString*）animationIDfinished:

（NSNumber*）finishedcontext:

（void*）context;

@end

（2）  在xCode打开MainView.m文件,加入下面代码

#import"MainViewController.h"

#import"MainView.h"

@implementationMainViewController

@synthesizeflakeImage;

-（void）viewDidLoad{

[superviewDidLoad];

//把背景颜色设置为冷色

self.view.backgroundColor=[UIColorcolorWithRed:

0.5green:

0.5blue:

1.0alpha:

1.0];

//把雪花图片文件不停导出

flakeImage=[UIImageimageNamed:

@"flake.png"];

//在onTimer设置开始时间每秒二十次

[NSTimerscheduledTimerWithTimeInterval:

（0.05）target:

selfselector:

@selector（onTimer）userInfo:

nilrepeats:

YES];

}

//Timereventiscalledwheneverthetimerfires

-（void）onTimer

{

//建立一个雪花图片flakeimage

UIImageView*flakeView=[[UIImageViewalloc]initWithImage:

flakeImage];

//usetherandom（）functiontorandomizeupourflakeattributes

intstartX=round（random（）%320）;

intendX=round（random（）%320）;

doublescale=1/round（random（）%100）+1.0;

doublespeed=1/round（random（）%100）+1.0;

//settheflakestartposition

flakeView.frame=CGRectMake（startX,-100.0,25.0*scale,25.0*scale）;

flakeView.alpha=0.25;

//puttheflakeinourmainview

[self.viewaddSubview:

flakeView];

[UIViewbeginAnimations:

nilcontext:

flakeView];

//setuphowfasttheflakewillfall

[UIViewsetAnimationDuration:

5*speed];

//setthepostionwhereflakewillmoveto

flakeView.frame=CGRectMake（endX,500.0,25.0*scale,25.0*scale）;

//setastopcallbacksowecancleanuptheflakewhenitreachesthe

//endofitsanimation

[UIViewsetAnimationDidStopSelector:

@selector（onAnimationComplete:

finished:

context:

）];

[UIViewsetAnimationDelegate:

self];

[UIViewcommitAnimations];

}

-（void）onAnimationComplete:

（NSString*）animationIDfinished:

（NSNumber*）finishedcontext:

（void*）context{

flakeView=nil;

[flakeViewremoveFromSuperview];

//openthedebuglogandyouwillseethatallflakeshavearetaincount

//of1atthispointsoweknowthereleasebelowwillkeepourmemory

//usageincheck

NSLog（[NSStringstringWithFormat:

@"[flakeViewretainCount]=%d",[flakeViewretainCount]]）;

[flakeViewrelease];

}

-（BOOL）shouldAutorotateToInterfaceOrientation:

（UIInterfaceOrientation）interfaceOrientation{

//ReturnYESforsupportedorientations

return（interfaceOrientation==UIInterfaceOrientationPortrait）;

}

-（void）didReceiveMemoryWarning{

[superdidReceiveMemoryWarning];//Releasestheviewifitdoesn’thaveasuperview

//Releaseanythingthat’snotessential,suchascacheddata

}

-（void）dealloc{

[flakeImagerelease];

[superdealloc];

}

@end

（3）导入下面图片文件

下载下面图片，放入SnowFall文件夹内并命名为下面名称

flake.png

在xCode下右键点击SnowFall->Add->ExistingFiles;在SnowFall文件夹内，选择下载好的图片，按Add，最后在xCode选择Build->BuildandGo;SaveAll.

以上就是小编为大家整理的苹果iOS实例编程入门教程，希望对大家有所帮助。