#pragma mark KVO
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
NSLog(@"dict= %@ obj= %@,keypath=%@",change,object,keyPath);
// if (object ==xxx) {
// if ([keyPath isEqualToString:@"title"]) {
//
// }else if ([keyPath isEqualToString:@"name"]) {
//
// }
// } else if(object == bbb){
//
// }
if (context == 123) {
} else if(context == 456){
}
}
-(void)traceObj:(Entry*)obj
{
[obj addObserver:self
forKeyPath:@"title"
options:0
context:123];
[obj addObserver:self
forKeyPath:@"name"
options:0
context:456];
[objB addObserver:self
forKeyPath:@"name"
options:0
context:NULL];
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
-(void)viewDidLoad
{
[super viewDidLoad];
Entry *entry =[[Entry alloc] init];
[self traceObj:entry];
[entry setValue:@"abc" forKey:@"title"];
id msg=[entry valueForKey:@"titl"];
NSLog(@"%@",msg);
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardShow:)
name:UIKeyboardWillHideNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(textChanged:)
name:UITextFieldTextDidChangeNotification
object:nil];
}
-(void)textChanged:(NSNotification*)noti
{
NSLog(@"%@ %@",input.text,[noti userInfo]);
NSString *sTr =input.text;
if ([sTr length] >=10) {
input.text = [sTr substringWithRange:NSMakeRange(0,9)];
UIAlertView *alert=[[[UIAlertView alloc] initWithTitle:@"title" message:@"message" delegate:self cancelButtonTitle:@"ok" otherButtonTitles:@"2",@"cancel",nil] autorelease];
[alert show];
}
NSMutableArray *array=[[NSMutableArray alloc] initWithCapacity:10];
}
-(void)keyboardShow:(NSNotification*)noti
{
if ([[noti name] isEqualToString:UIKeyboardWillShowNotification]) {
input.center = CGPointMake(input.center.x, input.center.y-200);
} else {
input.center = CGPointMake(input.center.x, input.center.y+200);
}
}
######################################
@implementation Entry
@synthesize title;
@synthesize price;
@synthesize image53;
@synthesize image;
-(id)valueForUndefinedKey:(NSString *)key
{
return [NSString stringWithFormat:@"%@ not have value for key %@",self,key];
}
-(void)setValue:(id)value forUndefinedKey:(NSString *)key
{
}
]]>
