IOS [__NSPlaceholderArray initWithObjects:count:]: 尝试从 objects[0]' 插入 nil 对象
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IOS [__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'
提问by roxeman3
I am trying to create a dynamic slide menu like facebook.
我正在尝试创建一个像 facebook 这样的动态幻灯片菜单。
I have to get some data from a json request. and display this data in one of the sections of the slide table view. I'm new in objective-c, I also tried with NSMutableArrays and I had an error. In other table views I do the same but without sections. only one MutableArray and I can show the table.
我必须从 json 请求中获取一些数据。并在幻灯片表视图的部分之一中显示此数据。我是objective-c的新手，我也尝试过NSMutableArrays，但出现错误。在其他表格视图中，我也这样做，但没有节。只有一个 MutableArray，我可以显示表格。
I do something like this:
我做这样的事情：
-(void) requestJSONFinishedWithParsedObject:(NSDictionary *)parsedObject{
NSArray *projectsObjectArray = [parsedObject objectForKey:@"projects"];
[self createMainNavigationController];
self.section1 = [NSArray arrayWithObjects:@"Profile", @"Notifications", @"Exit", nil];
self.section2 = [NSArray arrayWithObjects:@"Main", nil];
for (NSDictionary *projectObject in projectsObjectArray)
{
Project *newProject = [[Project alloc] init];
newProject.title= [projectObject objectForKey:@"title"];
self.section3 = [NSArray arrayWithObject:newProject.title];
}
self.menu = [NSArray arrayWithObjects:self.section1, self.section2, self.section3, nil];
[menuTableView reloadData];
}
I am having this error :
我有这个错误：
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'
回答by JeffN
It is because
这是因为
newProject.title= [projectObject objectForKey:@"title"];
is nil, and you are trying to add it to the array. Check to see what that value is by logging it
为零，并且您正尝试将其添加到数组中。通过记录它来检查该值是什么
NSLog(@"%@", [projectObject objectForKey:@"title"]);
