a boring developer

[iOS] About 'autorelease'

2010-10-31T17:58:00.001-07:00

autorelease.

Obj-C 로 개발하다가, 최초에 가장 헷갈렸던 개념중에 하나 인데,

autorelease라는 keyword탓이기도 하고, 지금 생각해보면, Apple탓이기도 한데,

"GC 가 알아서 해결해줄것임" 이라고 오해하기가 쉬운것 같다.

쉽게 얘기하면, autorelease를 특정 object에 걸어주면, release하는 시점을 연기한다고 이해 하면 된다.

그럼, 연기된 'release'가 언제 수행되는가 ?

그것을 알려면 NSAutoReleasePool 이라는 녀석을 알아야 한다.

object에 autorelease를 걸면,
current NSAutoReleasePool에 쌓이게 되고, NSAutoReleasePool이 Release될때, 함께 릴리즈 된다.

NSAutoReleasePool 은 Objective-C runtime에 의해 관리 되는데,
NSAutoReleasePool Object를 생성하게 되면, Stack처럼 쌓이게 되고,
top 에 있는 object가 current NSAutoReleasePool이 된다.

그래서 autorelease 를 많이 사용하는 application을 개발하면,
이 NSAutoReleasePool 관리에도 신경을 써서 개발해야만 한다.

[iOS] display multiple lines with UILabel

2010-10-30T16:50:00.000-07:00

UIKIT_EXTERN_CLASS @interface UILabel : UIView

{

....

}

@property(nonatomic) UILineBreakMode lineBreakMode; // default is UILineBreakModeTailTruncation. used for single and multiple lines of text

// this determines the number of lines to draw and what to do when sizeToFit is called. default value is 1 (single line). A value of 0 means no limit

// if the height of the text reaches the # of lines or the height of the view is less than the # of lines allowed, the text will be

// truncated using the line break mode.

@property(nonatomic) NSInteger numberOfLines;

You can set numberOfLines to display on UILabel set numberOfLines attribute.

[label setLineBreakMode:UILineBreakModeTailTruncation];

[label setNumberOfLines:2];

this code will display 2 line of text and if it overflow tail will be changed as "...."

Fitnesses + Spring

2010-10-27T09:30:00.001-07:00

Spring에, Fitnesses를 붙혀서, Fixture기반의 테스트를 하려고 시도하였는데,

딱히 잘되지 않았다.

Spring 3.0 기반으로 개발을 진행하다 보니, Annotation 기반으로, 개발을 하는데,

Junit4에서 SpringJunit4ClassRunner를 띄워 ApplicationContext를 Loading 하고 싶었는데,

Fitnesses Library를 Support하는 Spring Supportor Class도 없고, Fitnesses쪽에서도

지원하는 게 없다.

그래서 결국 ClassPathXmlApplicationContext Object를 생성해서, ApplicationContext를 Loading했고,

getAutowireCapableBeanFactory().autowireBean를 호출함으로써, FixtureClass내의

@Autowired된 Object를 Inject 하였다.

현재 상태로 목적은 달성하였지만, Fixture마다 다 호출 해주어야하기때문에 영 맘에 들지 않는다.

Library를 수정하지 않고, 어떤 깔끔한 방법이 없을까?

Sporing 이라는 Library에서 Static Method 기반으로 호출하여 해결하려는 걸 본적 있는데,

이것도 영 맘에 안든다.

Spring-Fitnesses Project라는곳에서는 SpringRowFixture등을 재정의해서 활용 하는것 같은데,

이것도 글쎄,, 해당 Class마다 FixtureLibrary Class를 상속받고 Spring에 필요한것들을 중복하여 써주는 형식이거나 Static Method를 호출하는 형식일텐데..

이것도 맘에 들지 않는다.

시간이 나면 Library를 수정해서, Junit4의 @Runwith 같은 형식으로 해결할수 있게 해볼까 한다.

My mackbook white is cracked.

2010-05-24T18:15:00.001-07:00

2 monthes ago, I waked up in the morning as usual.

When I moved my first step, I felt something wrong.

Yes, I stepped on my macbook, and it's lcd are broken.

At first time, there was only few lines, it bothered me but I thought I can leave it.

But now, it is getting worse. It's not mac'book' , just mac because I can't use this lcd anymore.

So I decide to fix it. It cost almost $160.

Guys, don't put your laptop under your bed. :(

My new place to work.

2009-12-02T22:02:00.001-08:00

Yesterday, I moved my place in office.

I totally satisfied with my new place.

It's much larger than old place.

Most importantly, nobody can see what I do :)

When I was in other place, everybody can see.

Actually I didn't care about that , but I can tell new place is much better to work and to surf the web :)

So, How do you think ? :)

Tweetie for Mac OS X Review

2009-12-01T20:31:00.000-08:00

I installed Tweetie for Mac OS X

And I'm writing short review about Tweetie.

Like other Mac OS X application, first impression was "yeah looks great".

But I really depressed with UI of "New Tweet".

What's wrong with this ?

Tweetie on iPhone was nice but, I really hard to accept this.

Even it has ugly User-Interface , it support everything that twitter can.

( Retweet is not supported yet, it's quite new function )

I think I'll continue to use this before I can find great looking Twitter Client.

Please tell me if you know some :)

Have a nice day

Windows 7 on MacBook.

2009-11-30T21:57:00.001-08:00

I used Windows 7 RC on my MacBook.

Few days ago, I purchase Windows 7 Ultimate K Edition for my laptop.

I installed it.

As RC version, it works perfectly and I totally satisfy with Windows 7.

Like others, Windows Vista make me down. But 7 is really good choice for people who don't want use 9 years old Windows XP.

I prefer that use Windows 7 than Mac OS X Leopard.

You should try it !!

[OSX] How to turn off beep sound in Terminal

2009-07-31T21:17:00.000-07:00

Open Prefereneces of 'Terminal' menu.

Go to 'advanced' tab and uncheck bell item.

That's all :)

[iPhone] save image to Photo Library.

2009-07-17T21:55:00.001-07:00

Hello, everyone.

Today, I'll see how I can save an Image to Photo Library.

Call 'UIImageWriteToSavedPhotoAlubm' method in UIImagePickerController.h with your 'UIImage object'.

That's all :) It's so easy, isn't it ?

Let me see the declaration of this method.

UIKIT_EXTERN void UIImageWriteToSavedPhotosAlbum(UIImage *image, id completionTarget, SEL completionSelector, void *contextInfo);

This method also adapt selector to inform complete ( or error).

A selector should be formed like....

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;

Have nice day, and wish your happiness :)

[iPhone] add info button to UIToolBar

2009-07-17T03:57:00.001-07:00

How can I insert 'info button' to UIToolBar ?

You should use 'UIBarButtonItem' to add some item to UIToolBar.

In example you can create it like below code.

UIBarButtonItem *actionItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:nil];

You can use UIBarButtonSystemItem* but there is no info button.

I noticed there is other init method named 'initWithCustomView'

You can create customized BarButtonItem with it.

I created info button with UIButton like below code.

UIButton *button = [UIButton buttonWithType:UIButtonTypeInfoLight];

[button addTarget:self action:@selector(infoPressed:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *infoItem = [[UIBarButtonItem alloc] initWithCustomView:button];

Let's do it !! :)

[iPhone - cocos2d] execute N-actions at once.

2009-07-05T19:31:00.000-07:00

Is there any way to execute N-actions at once ?

The answer is 'Yes, there is ".

There is a Class named 'Spawn' in Cocos2d library.

Let's see the Documentation of 'Spawn' Class.

@interface Spawn : IntervalAction
{
FiniteTimeAction *one;
FiniteTimeAction *two;
}

'Spawn' is an one of sub Class of 'IntervalAction'.
And basically it can have only 2 action.

But, as you can see, there is a class method names "actions:".
That method support N-Actions. How is it possible ?
The answer is simple, Spawn object can have other Spawn object as its property.

Let me show some example.

Action *action = [Spawn actions:[RotateBy actionWithDuration:aValue angle:180], [FadeIn actionWithDuration:aValue], [ScaleTo actionWithDuration:aValue scale:1.5],nil];

Spawn have 'RotateBy' and ' FadeIn' and 'ScaleTo'

And those actions will be executed at a time.

Enjoy your development :)

[iPhone] XML parsing on iPhone SDK

2009-05-28T21:18:00.000-07:00

There are 3 ways to handle XML document in iPhone SDK.

First of all, use NSXMLParser provided by iPhone SDK.
Rest of them, use library.

NSXMLParser use Event-Driven XML Parsing (async ).
I need a way to parse XML in sync.

So I checked the other ways.

There are 2 project that you can use.

'TouchXML' and 'libxml'.

'TouchXML' is works on the 'libxml'. So I skipped 'TouchXML' and I'll try with 'libxml'.

To use 'libxml' in your Xcode Project you have to add Framework.
And change build configuration.

Add 'libxml2.2.dylib' into your Project and

Add 'Header Seach Path' as '/usr/include/libxml2' like below image.

- Header Serach Path -

Now impoert header file for libxml(libxml/xmlmemory.h)

Use 'xmlParseMemory' to parse XML in memory.
Use 'xmlReadFile' to parse XML file.

Return type of these APIs are same 'xmlDocPtr'
You should call 'xmlFreeDoc' after finish your work.

I'll show you how we can see the elements in XML.

- (void)printElementName:(xmlNode *)a_node
{
xmlNode *cur_node = NULL;

for (cur_node = a_node; cur_node; cur_node = cur_node->next) {
if (cur_node->type == XML_ELEMENT_NODE) {
NSLog(@"node type: Element, name: %s\n", cur_node->name);
}
[self printElementName: cur_node->children];
}
}
- (void)applicationDidFinishLaunching:(UIApplication *)application {

NSString *path = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"test.xml"];
xmlDocPtr doc = xmlReadFile([path UTF8String], "UTF-8", 0);

xmlNodePtr root = xmlDocGetRootElement(doc);
[self printElementName:root];
xmlFreeDoc(doc);
}

Now, you can parse XML with iPhone SDK :)

Thank you for visit my Blog.

My First Post.

2009-05-26T19:22:00.000-07:00

Hello, Everyone.

I'm Taehoon Koo who live in Seoul, Korea.

This is my first post on this Blog. So, I'll introduce my self.
I graduated Hongik University in Korea, and My major is compter engineering
Now I work for DGStation where make Digital Satellite Receivers.

Personally, I have a lot of interest on developing iPhone Apps, Website or Webserice.
I'm trying to release my first iPhone App.
I'll post the information, soon :)

Anyone who want be a friend with me, don't hesitate send an email to me, please :)

Thank you for visit my Blog and I hope you have a nice day :)