binding

ex:

binding Slider's value to a key, then slider's value will sync with key

How to do:

In slider's inspect, set its binding 

(1)set bind to class A

(2)set A's  test member as model key path

key value coding

ex:

.h檔

@interface AppController : NSObject {

int test;

}

@end

.m檔

// set test

[self setValue:[NSNumber numberWithInt:5]

forKey:@"test"];

// get test

NSNumber *n=[self valueForKey:@"test"];

// is called when valueForKey is called

-(int)test

{

NSLog(@"test is returning %d", fido);

return fido;

}

// is called when setValue is called

-(void)setTest:(int)x

{

NSLog(@"setTest is called with %d", x);

fido=x;

}

delegate

if B is delegate of A,  when something happens to A,  B's method is called

ex:

B is  TableView's delegate 

B implement following method:

-(void)tableViewSelectionDidChange:(NSNotification*)notification 

when the selection row is table is changed ,  this method is called

NSTableView

data source:

decide the content of the table

implement two methods:

-(int)numberOfRowInTableView:(NSTableView*)tv

-(id)tableView:(NSTableView*)tv

                           objectValueForTableColumn:(NSTableColumn*)tableColumn

                           row:(int)row

NSWindow

initialFirstResponder outlet:

this outlet decides which view should be receiving keyboard events when window appears 

NSButton, NSSlider

NSButton:

oval button, square button ,  check box

methods:

-(void)setEnabled:(BOOL)yn

-(int)state

if return NSOnState(1), the check box is on

if return NSOffState(0), the check box is off

-(void)setState:(int)aState

NSSlider:

-(void)setFloatValue:(float)x

-(float)floatValue

NSTextField:

-(NSString*)stringValue

-(void)setStringValue:(NSString*)aString

NSFormatter can convert a string into another type , and vice versa

-(NSObject*) objectValue

-(void)setObjectValue:(NSObject*)obj

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