2014/10/15 下午 10:10:48

iphone Programming Glossary: kvc

How do I record audio on iPhone with AVAudioRecorder?

http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder

When recording is done I save the recorded audio as NSData in the currently edited object using KVC. #define DOCUMENTS_FOLDER NSHomeDirectory stringByAppendingPathComponent @ Documents void startRecording..

Difference between objectForKey and valueForKey?

http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey

have the same key just as no two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its.. setAccountNumber anAccountNUmber NSNumber anotherAccountNumber newAccount accountNumber Using KVC I can access the property dynamically NSNumber anAccountNumber NSNumber numberWithInt 12345 Account.. Those are equivalent sets of statements. I know you're thinking wow but sarcastically. KVC doesn't look all that useful. In fact it looks wordy . But when you want to change things at runtime..

To ARC or not to ARC? What are the pros and cons?

http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons

a struct . This is fairly rare but sometimes it's used to pack data. If you did not follow correct KVC naming and you intermix ARC and non ARC code you will have memory problems. ARC uses KVC naming to make.. correct KVC naming and you intermix ARC and non ARC code you will have memory problems. ARC uses KVC naming to make decisions about memory management. If it's all ARC code then it doesn't matter because.. management rules and I'd probably only mention the memory management naming rules while discussing KVC naming. With ARC I believe you could actually become a decent beginning programmer without learning..

How do I record audio on iPhone with AVAudioRecorder?

http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder

why I am removing the recorded file through the File Manager. When recording is done I save the recorded audio as NSData in the currently edited object using KVC. #define DOCUMENTS_FOLDER NSHomeDirectory stringByAppendingPathComponent @ Documents void startRecording UIBarButtonItem stopButton UIBarButtonItem alloc initWithTitle..

Difference between objectForKey and valueForKey?

http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey

A key is an arbitrary string you provide. No two objects can have the same key just as no two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its name. So for instance if I have an Account class with a property.. 12345 Account newAccount Account alloc init newAccount setAccountNumber anAccountNUmber NSNumber anotherAccountNumber newAccount accountNumber Using KVC I can access the property dynamically NSNumber anAccountNumber NSNumber numberWithInt 12345 Account newAccount Account alloc init newAccount setValue anAccountNumber.. NSNumber anotherAccountNumber newAccount valueForKey @ accountNumber Those are equivalent sets of statements. I know you're thinking wow but sarcastically. KVC doesn't look all that useful. In fact it looks wordy . But when you want to change things at runtime you can do lots of cool things that are much more difficult..

To ARC or not to ARC? What are the pros and cons?

http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons

have much of this in any case. You cannot put an id in a struct . This is fairly rare but sometimes it's used to pack data. If you did not follow correct KVC naming and you intermix ARC and non ARC code you will have memory problems. ARC uses KVC naming to make decisions about memory management. If it's all ARC code.. but sometimes it's used to pack data. If you did not follow correct KVC naming and you intermix ARC and non ARC code you will have memory problems. ARC uses KVC naming to make decisions about memory management. If it's all ARC code then it doesn't matter because it will do it the same wrong on both sides. But if it's mixed.. spend no more than five minutes on the actual memory management rules and I'd probably only mention the memory management naming rules while discussing KVC naming. With ARC I believe you could actually become a decent beginning programmer without learning the memory management rules at all. But you couldn't become..

How do I record audio on iPhone with AVAudioRecorder?

http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder

the File Manager. When recording is done I save the recorded audio as NSData in the currently edited object using KVC. #define DOCUMENTS_FOLDER NSHomeDirectory stringByAppendingPathComponent @ Documents void startRecording UIBarButtonItem..

Difference between objectForKey and valueForKey?

http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey

No two objects can have the same key just as no two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its name. So for instance.. alloc init newAccount setAccountNumber anAccountNUmber NSNumber anotherAccountNumber newAccount accountNumber Using KVC I can access the property dynamically NSNumber anAccountNumber NSNumber numberWithInt 12345 Account newAccount Account alloc.. valueForKey @ accountNumber Those are equivalent sets of statements. I know you're thinking wow but sarcastically. KVC doesn't look all that useful. In fact it looks wordy . But when you want to change things at runtime you can do lots of..

Using valueForKeyPath on NSDictionary if a key starts the @ symbol?

http://stackoverflow.com/questions/1567850/using-valueforkeypath-on-nsdictionary-if-a-key-starts-the-symbol

KVC vs fast enumeration

http://stackoverflow.com/questions/16337362/kvc-vs-fast-enumeration

vs fast enumeration Which of the following is faster and why CGFloat sum 0 for UIView v in self.subviews sum v.frame.size.height.. Key Value Coding gives us a much more concise almost Ruby like way to do this employees valueForKeyPath @ @avg.salary KVC Collection Operators allows actions to be performed on a collection using key path notation in valueForKeyPath . Any time..

What's the nicest way to do observer/observable in objective-c (iphone version)

http://stackoverflow.com/questions/165790/whats-the-nicest-way-to-do-observer-observable-in-objective-c-iphone-version

a list of listeners that it notifies of different events. I've played with Objective C on the Mac and that has KVC and binding which seems to work very nicely and requires less code. The iPhone SDK doesn't seem to have this functionality..

Finding maximum numeric value in NSArray

http://stackoverflow.com/questions/3080540/finding-maximum-numeric-value-in-nsarray

so I am using iOS4 GM if that makes any difference. iphone objective c nsarray share improve this question The KVC approach looks like this int max numbers valueForKeyPath @ @max.intValue intValue or NSNumber max numbers valueForKeyPath..

Using NSMutableDictionary as backing store for properties

http://stackoverflow.com/questions/5873776/using-nsmutabledictionary-as-backing-store-for-properties

for a shorthand way of setting my properties directly to an NSMutableDictionary that is a instance variable. ie KVCModle.h @interface KVModel NSObject NSMutableDictionary data @property nonatomic assign NSString string1 @property nonatomic.. NSMutableDictionary data @property nonatomic assign NSString string1 @property nonatomic assign NSString string2 @end KVCModel.m #import KVModel.h @implementation KVModel id init self super init if self data NSMutableDictionary alloc init return.. the former is exactly the same as foo obj foo and the latter is exactly the same as obj setFoo foo . There is no KVC code to intercept. Properties are at the language level KVC is at the framework level. You'll need to intercept the accessor..

Getting an NSArray of a single attribute from an NSArray

http://stackoverflow.com/questions/5968702/getting-an-nsarray-of-a-single-attribute-from-an-nsarray

c ios4 iphone sdk 3.0 cocoa design patterns share improve this question NSArray will handle this for you using KVC NSArray people ... NSArray firstName people valueForKey @ firstName This will give you an array of the firstName values..

What's the best way to use Obj-C 2.0 Properties with mutable objects, such as NSMutableArray?

http://stackoverflow.com/questions/816720/whats-the-best-way-to-use-obj-c-2-0-properties-with-mutable-objects-such-as-ns

To ARC or not to ARC? What are the pros and cons?

http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons

cannot put an id in a struct . This is fairly rare but sometimes it's used to pack data. If you did not follow correct KVC naming and you intermix ARC and non ARC code you will have memory problems. ARC uses KVC naming to make decisions about.. If you did not follow correct KVC naming and you intermix ARC and non ARC code you will have memory problems. ARC uses KVC naming to make decisions about memory management. If it's all ARC code then it doesn't matter because it will do it the.. the actual memory management rules and I'd probably only mention the memory management naming rules while discussing KVC naming. With ARC I believe you could actually become a decent beginning programmer without learning the memory management..

RestKit Object Mapping Relationships without KVC

http://stackoverflow.com/questions/9318565/restkit-object-mapping-relationships-without-kvc

Object Mapping Relationships without KVC After reading the Object Mapping Guide on GitHub for RestKit my problem didn't disappear so perhaps somebody can say if..