Handler中的数组计数

Question

我想在handler中获取arraycount，然后根据Count调用webservice .But数组计数给我数组。

__weak NewsViewController *self_ = self;
    [table addInfiniteScrollingWithActionHandler:^{
        NSLog(@"%lu",(unsigned long)[tableDataArray count]); // This Line give error Capturing self strongly in this block lead to retain cycle;
        [self_ callWebService];
    }];

Answer 1

尝试创建一个指向tableDataArray的弱指针（如自我）

__weak typeof(NSMutableArray*) _w_tableDataArray = tableDataArray;
__weak NewsViewController *self_ = self;
[table addInfiniteScrollingWithActionHandler:^{
        NSLog(@"%lu",(unsigned long)[_w_tableDataArray count]); // This Line give error Capturing self strongly in this block lead to retain cycle;
        [self_ callWebService];
    }];

Answer 2

虽然你正在创造一个弱小的自我，但你实际上并没有在街区中引用它。当您致电[tableDataArray count];时，相当于在您的情况下致电self.tableDataArray，您应该致电self_.tableDataArray;。

为清楚起见，其示例性用途如下：

...
@property (nonatomic, strong) NSMutableArray *tableDataArray;
...
...

__block __weak NewsViewController *welf = self;
[table addInfiniteScrollingWithActionHandler:^{
    NSLog(@"%li", welf.tableDataArray.count);
    [welf callWebService];
}];

是welf代表弱者。