Question

@property (nonatomic, strong) NSArray *friendsList;

// some method
...
[FBRequestConnection startWithGraphPath:@"/me/friends" parameters:nil HTTPMethod:@"GET" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {

_friendsList = [result objectForKey:@"data"];

}];

我的代码是否正确？我没有任何警告和代码构建没有错误，所有工作都很好，但我想知道，如果有任何隐藏的问题，如隐式保留？

Answer 1

该行

_friendsList = [result objectForKey:@"data"];

表示

 self->_friendsList = [result objectForKey:@"data"];

该行保留自己，如果不是问题，那么一切都很好。如果有问题，可以使用：

__weak typeof(self) selfWeak = self;
FBRequestConnection startWithGraphPath:@"/me/friends" parameters:nil HTTPMethod:@"GET" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
 __strong typeof(selfWeak) selfStrong = selfWeak;
if(selfStrong)
{
    selfStrong.friendsList = [result objectForKey:@"data"];
}
}];

隐含保留在块目标-c ARC中

1 个答案: