我有两个班级
班级A.h档案
@property (nonatomic, weak) id delegate;
-(void)displayAllGroups:(NSArray *)groups;
班级A.m文件
@synthesize delegate;
view didLoad {
_array_groups = [Group getAllGroups:json];
if ([_array_groups isKindOfClass:[NSArray class]])
{
NSLog(@"type of NSArray");//
[delegate displayAllGroups:_array_groups];// error
}
else
{
NSLog(@"not a type of NSArray");
}
}
这是A类的实现,我使用id委托将group_array
发送到b类。 B级是打击
- (void)viewDidLoad {
[super viewDidLoad];
GroupsViewController *groupView=[[GroupsViewController alloc]init];
[groupView setDelegate:self];
}
-(void)displayAllGroups:(NSArray *)groups
{
NSLog(@"all groups arrays are:%@",groups);
}
注意:错误为[delegate displayAllGroups:_array_groups];
-[HomeViewController displayAllGroups:]: unrecognized selector sent to instance 0x7fbfcb644b20'
答案 0 :(得分:1)
为B类创建协议,如下所示
@protocol B_Delegate <NSObject>
@optional
-(void)displayAllGroups:(NSArray *)groups;
@end
更改委托声明如下
@property (nonatomic, weak) id <B_Delegate> delegate;
将删除错误。