Recovering a deleted App Name in Apple Store

If you want to use a App Name in your new Apple Developer Account, which already used in your another apple account, even though the status is "Developer Removed From Sale". iTunes Connect will disallow you,  the error message will be like "the app name you entered has already been used".


There is a solution based on the following link: http://hesh.am/2012/01/recovering-a-deleted-app-name-in-itunes-connect/


As long as you change your default language when you creating your new app, iTunes Connect will allow you to create a new app even they have the same name.

For example , change the default language from Australian English to English.

iOS Interview Questions

From: http://www.raywenderlich.com/53962/ios-interview-questions

1. Explain method swizzling. When you would use it?

2.Take three objects: a grandparent, parent and child. The grandparent retains the parent, the parent retains the child and the child retains the parent. The grandparent releases the parent. Explain what happens.

3. What happens when you invoke a method on a nil pointer?  

4. Give two separate and independent reasons why retainCount should never be used in shipping code.

5. Explain your process for tracing and fixing a memory leak.

6. Explain how an autorelease pool works at the runtime level.

7. When dealing with property declarations, what is the difference between atomic and non-atomic?

8. In C, how would you reverse a string as quickly as possible?

9. Which is faster: to iterate through an NSArray or an NSSet

10. Explain how code signing works.

11. What is posing in Objective-C?

12. List six instruments that are part of the standard.

13. What are the differences between copy and retain?

14. What is the difference between frames and bounds?

15. What happens when the following code executes? Ball *ball = [[[[Ball alloc] init] autorelease] autorelease];

16. List the five iOS app states.

17. Do you think this interview was a good representation of your skills as a developer?

Learning Python -- Part two

1. Dictionary

    dic = {'lilei':90,'lily':100,'sam':57, ''tom" :90}
   
    for key in dic
        print dic[key]

    print dic.keys(),  return all keys
            dic.values(), return all values
            dic.items(),  return all element
            dic.clear(),  clear dic, dic become {}

   del dic['tom']  , delete 'tom' in dic, del is the keyword
   
2. file
   
    f = open(filename, mode), "r" read, "w" write
    content  = f.read(N) , read N bytes data
    content  = f.readline(), read one line
    content = f.readlines(), read all the lines

    f.write('I like apple'), write to file

    f.close()

3. range(), enumerate(), zip()
    S = 'abcdefghijk'
    for i in range(0,len(S),2):
        print S[i]
 
    for (index,char) in enumerate(S):
        print index
        print char
 
    ta =[1,2,3]
    tb = [9,8,7]
    tc = ['a','b','c']
    for (a,b,c) in zip(ta,tb,tc)
        print(a,b,c)

    ta = [1,2,3]
    tb = [9,8,7]
    zipped = zip(ta,tb)
    print(zipped)

    na,nb = zip(*zipped)
    print(na,nb)


4. lambda
    func = lambda x,y: x+ y
    print func(3,4)

    def teset(f,a,b):
        print 'test'
        print f(a,b)
   test(func,3,5)

   test((lambda x: x+3),[1,3,5,6])

5. map
    re = map((lambda x,y: x+y),[1,2,3],[6,7,9])

6. filter
    def func(a)
        if a> 100:
            return True
        else:
            return False

   print filter(func,[10,56,101,500])

7. reduce
    print reduce((lambda x,y: x+y),[1,2,5,7,9])

8.  debug
     re = iter(range(5))

     try:
         for i in range(100):
             print re.next()
     except StopIteration:
         print 'Here is end ',i
    print 'HaHaHa'


    try:
        ...
    except error1:
        ...
    except error2:
        ...
    else:
        ...
    finally:
        ...

Learning Python - part one

1.  print 'Hello World'
     a = 10
     print a
     print type(a)
 
     a = 1.3
     print a
     print type(a)

     basic type:
     a = 10     int     a =1.3 float       a = True  True/False    a = 'Hello'  string
     type() - return data type
 
 2.  Sequence:
      Tuple : s1 = (2, 1.3, 'love',9,12,false)  , element can not be change
     
      List: s2 = [True, 5, 'smile']  , element can change

      print s1[0]
      print s2[2]
      s2[1] = 3.0
      print s2

      print s1[:5]  -- from start to element 4
      print s1[2:]  -- from element 2 to last
      print s1[0:5:2]  -- from index 0 to element 4 , every 2 to get a element, such as element 0,2,4
      print s1[2:0:-1] -- from element 2 to element 1

      print s1[-1] -- last element
      print s1[-3] -- the last third element

3. If else
    i = 1
    if i>0:
        print 'positive i'
        i = i+1
    elif i ==0:
        print 'i is 0'
        i = i *10
    else:
       print 'negative i'
       i = i -1
    print 'new i:',i

4.  for, while, continue, break
   
     for a in [3,4.4, 'lift']:
         print a

     while i< 10:
         print i
         i = i+1

5. function
    def square_sum(a,b)
        c = a**2 + b ** 2
        return c

    print square_sum(3,4)

6. class , object
    class Bird(object)
        have_feather = True
        way_of_reproduction = 'egg'
        def move(self,dx,dy):
            position =[0,0]
            position[0] = position[0]+dx
            position[1] = position[1] +dy
            return position

 summer = Bird()
 print 'after move:', summer.move(5,8)

 class Chicken(Bird):
     way_of_move = 'walk'
     possible_in_KFC = True

summer = Chicken()
print summer.have_feather
print summer.move(5,6)


7. dir(), help()
    print dir(list)
    print help(list)

    n1 = [1,2,5,3,5]
    n1.count(5),   how many 5
    n1.index(3),   index of the first 3
    n1.append(6), add 6 to the list
    n1.sort(), sort
    n1.pop(), remove the last element and return it
    n1.remove(2), remove the first 2
    n1.insert(0,9), insert 9 to position 0
 

iOS -- Core Image

• CIContext. All of the processing of a core image is done in a CIContext. This is somewhat similar to a Core Graphics or OpenGL context.
• CIImage. This class hold the image data. It can be creating from a UIImage, from an image file, or from pixel data.
• CIFilter. The filter class has a dictionary that defines the attributes of the particular filter that it represents. Examples of filters are vibrance filters, color inversion filters, cropping filters, and much more.

1.declare

@implementation ViewController

{

    CIContext *context;

    CIFilter *filter;

    CIImage *beginImage;

}

2. change

    NSString *filePath = [[NSBundle mainBundle]pathForResource:@"image" ofType:@"png"];

    

    NSURL *fileNameAndPath = [NSURL fileURLWithPath:filePath];

    

    beginImage = [CIImage imageWithContentsOfURL:fileNameAndPath];

    

    context = [CIContext contextWithOptions:nil];

    

    filter = [CIFilter filterWithName:@"CISepiaTone" keysAndValues:kCIInputImageKey,beginImage,@"inputIntensity",@0.8, nil];

    

    CIImage *outputImage = [filter outputImage];

    

    CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];

    UIImage *newImage = [UIImage imageWithCGImage:cgimg];

    

    self.imageView.image = newImage;

iOS - URL SCHEME

To configure URL SCHEME

In Xcode project, info.

Open the app in code:

  NSString *format = @"birdland://";

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:format]];

   

    [[UIApplication sharedApplication] openURL:url];

iOS - KVO programming

declare object:
interface StockData : NSObject {
   NSString * stockName;
   float price;
}
@end
@implementation StockData
@end

Add Observer:
[stockForKVO addObserver:self forKeyPath:@"price" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:NULL];  

Set Value:
myLabel.text = [stockForKVO valueForKey:@"price"];  

Reset Value, trigger observer method:
[stockForKVO setValue:@"20.0" forKey:@"price"];  


Call observer method:
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if([keyPath isEqualToString:@"price"])
    {
        myLabel.text = [stockForKVO valueForKey:@"price"];
    }

}

Remove observer:
- (void)dealloc
{
    [super dealloc];
    [stockForKVO removeObserver:self forKeyPath:@"price"];
    [stockForKVO release];
}