Objective-C 常用代碼記要

NSImage與NSData之間轉換

NSData *imageData = [NSData
dataWithContentsOfFile: imagePath];

   
UIImage *aimage = [UIImage
imageWithData: imageData];

   
//UIImage－> NSData

   
NSData *imageData = UIImagePNGRepresentation(aimae);

隨機數

srandom(time(NULL));

產生 5 ------20
之間的一個隨機數

int n =
5 + (int) (20.0 * (random() / (RAND_MAX +
1.0)));

srand和rand官方已經不推薦使用。原因是產生隨機數的效能不是很好， 

另外是隨機數的隨機性沒有random好，
再者就是不是安全執行緒。

NSLog(@"%@",NSStringFromSelector(_cmd));

前往模擬器調試下的程式目錄

/private/var/root/Library/Application Support/iPhone Simulator/5.1/Applications

讀取序列化檔案

NSString *resourcePath = [[NSBundle
mainBundle] resourcePath];

NSString *path = [[NSString
alloc]initWithFormat:@"%@/president.plist",resourcePath];

NSData *data = [[NSData
alloc]initWithContentsOfFile:path];

President *thePres = [NSKeyedUnarchiver
unarchiveObjectWithData:data];

儲存序列化檔案

NSString *resourcePath = [[NSBundle
mainBundle] resourcePath];

   
NSString *path = [[NSString
alloc]initWithFormat:@"%@/president.plist",resourcePath];

   
NSData *data = [NSKeyedArchiver
archivedDataWithRootObject:self.president];

   
if([data
writeToFile:path atomically:NO])

    {

       
UIAlertView *alert = [[UIAlertView
alloc]initWithTitle:@"System"
message:@"儲存成功！" delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil,
nil];

        [alert
show];

        [alert
release];

    }

訪問主控委託

AppDelegate *delegate = [[UIApplication
sharedApplication]delegate];

訪問主程式

   
UIApplication *app = [UIApplication
sharedApplication];

2)添加自訂的產生後指令碼

在Build Phases中添加一個Phase，右下角的Add
Build Phase，然後單擊Add Run Script，輸入以下指令碼

export CODESIGN_ALLOCATE=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/codesign_allocate

if [ "${PLATFORM_NAME}" == "iphoneos" ]; then

/Developer/iphoneentitlements401/gen_entitlements.py "my.company.${PROJECT_NAME}" "${BUILT_PRODUCTS_DIR}/${WRAPPER_NAME}/${PROJECT_NAME}.xcent";

codesign -f -s "iPhone Developer" --entitlements "${BUILT_PRODUCTS_DIR}/${WRAPPER_NAME}/${PROJECT_NAME}.xcent" "${BUILT_PRODUCTS_DIR}/${WRAPPER_NAME}/"

fi