Como usar os protocolos objective-c
Eu preciso herdar Picker valores selecionados para o outro lugar. Eu estou tentando o código abaixo, mas o valor nulo está chegando .. por favor, verifique onde estou indo errado. Eu tenho que Herdar valores String que tem sido passa noPickerView
..por favor verifique o código
Picker1.h
#import <UIKit/UIKit.h>
@protocol pickerDelegate <NSObject>
-(void)didFinishPicking:(NSString *)pickedStr;
@end
@interface
@property(nonatomic,retain)id<pickerDelegate>delegate;
picker.m
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
string=[NSString stringWithFormat:@"%@",[list objectAtIndex:row]];
label.text=string;
[self.delegate didFinishPicking:string];
}
- (void)viewDidLoad
{
[super viewDidLoad];
list =[[NSMutableArray alloc]init];
[list addObject:@"a"];
[list addObject:@"b"];
}
Acitivity_1.h
#import <UIKit/UIKit.h>
#import "Picker1.h"
@interface Activity_1 : UIViewController<UIApplicationDelegate, pickerDelegate>{
@property(nonatomic,retain)Picker1 *delegate1;
@property (nonatomic,retain)NSString *str;
@end
Activity_1.m
- (void)viewDidLoad
{
[super viewDidLoad];
**this is how i print the value but value is null**
NSLog(@"delegate1%@",self.delegate1.string);
delegate1 = [[Picker1 alloc] init];
[delegate1 setDelegate : self];
}
-(void)didFinishPicking:(NSString *)pickedStr
{
[self setStr:pickedStr];
}