I suggest that you follow Sprite Kit’s coordinate and rotation conventions. Specifically, your sprite image should be facing right at zero degrees (the default value), and a positive value is a counter-clockwise rotation. That said, here's one way to apply an impulse in the direction a sprite is facing:
// Specify the force to apply to the SKPhysicsBody
CGFloat r =5;
// Create a vector in the direction the sprite is facing
CGFloat dx = r * cos (sprite.zRotation);
CGFloat dy = r * sin (sprite.zRotation);
// Apply impulse to physics body
[sprite.physicsBody applyImpulse:CGVectorMake(dx,dy)];

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6月 14 週日 201513:42
Random float between two numbers? ios 隨機浮點數小數

#define ARC4RANDOM_MAX 0x100000000

Your code means this:

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6月 14 週日 201513:40
itunes connect上传截图提示无法载入文件问题

上传快照的时候提示“无法载入文件，请再试一次”，图片尺寸和格式都是没有问题的
A:文件名或路径中含有中文

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5月 30 週六 201512:29
Xcode 6: create new Objective C file messed up? xcode6 新建 objc 檔案

everything is the quite similar to what was before, but here is the procedure in Xcode6 beta6:
#1
choose the New and File... or press ⌘N on keyboard:

#2
choose iOS, Source then Cocoa Touch Class:

#3
type the name of your new class (e.g. HelloWorldClass), it is a subset of the NSObject, and you need to choose the Language as well:

#4
after you saved the files, you can find them in the Project Navigator like I did:

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5月 30 週六 201512:06
半透明UIViewController 半透明頁面 ios UIViewController 推出另外一个半透明的UIViewController

主要操作：(用來io7以下)
1. 视图1（ViewController1）中添加以下代码
ViewController2 *lagerPicVC = [[ViewController2 alloc]init];

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5月 30 週六 201512:04
[轉]Making the iPhone vibrate ios 震動實現

There are two seemingly similar functions that take a parameter kSystemSoundID_Vibrate:
1)AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);2)AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

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5月 30 週六 201512:01
[轉][iOS Dev] NSUserDefaults Save/Read/Clear 儲存/讀取/清除速記使用者記錄使用者設定 SharedPreferences

 
// 定義名稱 define key

#define kIsActive @"isActive"

#define kUserName @"userName"

// 讀取資料

-(void)loadInfo {

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

NSLog(@"Name : %@", [defaults stringForKey:kUserName]);

NSLog(@"isActive : %@", ([defaults boolForKey:kIsActive] ? @"YES" : @"NO"));

}

// 儲存資料

-(void)saveInfo {

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

NSString *userName = @"Hank";

BOOL isActive = YES;

[defaults setObject:userName forKey:kUserName];

[defaults setBool:isActive forKey:kIsActive];

}

// 清除資料

-(void)clearInfo {

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

[defaults removeObjectForKey:kUserName];

[defaults removeObjectForKey:kIsActive];

}

// 執行

- (void)viewDidLoad

{

[super viewDidLoad];

[self saveInfo];

[self loadInfo];

[self clearInfo];

[self loadInfo];

}

view raw NSUserDefaultsSample.m hosted with ❤ by GitHub

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5月 30 週六 201511:54
ios uiview animate frame

[UIView animateWithDuration:0.5
delay:1.0
options: UIViewAnimationCurveEaseOut
animations:^{
self.basketTop.frame = basketTopFrame;
self.basketBottom.frame = basketBottomFrame;
}
completion:^(BOOL finished){
NSLog(@"Done!");
}];
[UIView animateWithDuration:0.6f

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5月 30 週六 201511:50
常用數學函數（轉貼） ios objc

http://0922267152.blogspot.tw/2011/04/blog-post_13.html

Math functions

double pow ( double, double ) - power of

NSLog(@"%.f", pow(3,2) ); //result 9
NSLog(@"%.f", pow(3,3) ); //result 27

double sqrt( double ) - square root

NSLog(@"%.f", sqrt(16) ); //result 4
NSLog(@"%.f", sqrt(81) ); //result 9

double ceil ( double ) - if the argument has any decimal part, returns the next bigger integer

NSLog(@"res: %.f", ceil(3.000000000001)); //result 4
NSLog(@"res: %.f", ceil(3.00)); //result 3

double floor ( double ) - removes the decimal part of the argument

NSLog(@"res: %.f", floor(3.000000000001)); //result 3
NSLog(@"res: %.f", floor(3.9999999)); //result 3

double round ( double ) - rounds the argument

NSLog(@"res: %.f", round(3.5)); //result 4
NSLog(@"res: %.f", round(3.46)); //result 3
NSLog(@"res: %.f", round(-3.5)); //NB: this one returns -4

double fmin ( double, double ) - returns the smaller argument

NSLog(@"res: %.f", fmin(5,10)); //result 5

double fmax ( double, double ) - returns the bigger argument

NSLog(@"res: %.f", fmax(5,10)); //result 10

double fabs( double ) - returns the absolute value of the argument

NSLog(@"res: %.f", fabs(10)); //result 10
NSLog(@"res: %.f", fabs(-10)); //result 10

Few math constants

As found in the math.h

#define M_E 2.71828182845904523536028747135266250 /* e */
#define M_LOG2E 1.44269504088896340735992468100189214 /* log 2e */
#define M_LOG10E 0.434294481903251827651128918916605082 /* log 10e */
#define M_LN2 0.693147180559945309417232121458176568 /* log e2 */
#define M_LN10 2.30258509299404568401799145468436421 /* log e10 */
#define M_PI 3.14159265358979323846264338327950288 /* pi */
#define M_PI_2 1.57079632679489661923132169163975144 /* pi/2 */
#define M_PI_4 0.785398163397448309615660845819875721 /* pi/4 */
#define M_1_PI 0.318309886183790671537767526745028724 /* 1/pi */
#define M_2_PI 0.636619772367581343075535053490057448 /* 2/pi */
#define M_2_SQRTPI 1.12837916709551257389615890312154517 /* 2/sqrt(pi) */
#define M_SQRT2 1.41421356237309504880168872420969808 /* sqrt(2) */
#define M_SQRT1_2 0.707106781186547524400844362104849039 /* 1/sqrt(2) */
#define MAXFLOAT ((float)3.40282346638528860e+38)

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5月 30 週六 201511:48
[轉] 2015最新AppStore上架流程 ios

來源：http://blog.csdn.net/baidu_21172753/article/details/42678487

1.进入 https://developer.apple.com，选择Member Center，进去后点击iTunes Connect，输入账号密码。进去后，点击我的APP，然后点击左侧的加号，就可以创建应用了
2.创建应用需要填写必要信息

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pcwiki的部落格

歡迎光臨pcwiki在痞客邦的小天地

Sprite Kit rotation angle

Random float between two numbers? ios 隨機浮點數小數

itunes connect上传截图提示无法载入文件问题

Xcode 6: create new Objective C file messed up? xcode6 新建 objc 檔案

半透明UIViewController 半透明頁面 ios UIViewController 推出另外一个半透明的UIViewController

[轉]Making the iPhone vibrate ios 震動實現

[轉][iOS Dev] NSUserDefaults Save/Read/Clear 儲存/讀取/清除速記使用者記錄使用者設定 SharedPreferences

ios uiview animate frame

常用數學函數（轉貼） ios objc

Math functions

Few math constants

[轉] 2015最新AppStore上架流程 ios

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