objective-c 故事板和自定义初始化
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Storyboard and custom init
提问by Mark Molina
I recently tried working with the MainStoryboard.storyboard within Xcode and so far It's going pretty good and I'm wondering why I've never used it before. While playing with some code I bumped into an obstacle and I don't know how to resolve this.
我最近尝试在 Xcode 中使用 MainStoryboard.storyboard ，到目前为止效果很好，我想知道为什么我以前从未使用过它。在玩一些代码时，我遇到了一个障碍，我不知道如何解决这个问题。
When I alloc and init a new ViewController (with a custom init I declared in the ViewControllers class) I would do something like this:
当我分配并初始化一个新的 ViewController（使用我在 ViewControllers 类中声明的自定义初始化）时，我会做这样的事情：
ViewController *myViewController = [[ViewController alloc] initWithMyCustomData:myCustomData];
Then after that I could do something like:
然后在那之后我可以做这样的事情：
[self presentViewController:myViewController animated:YES completion:nil];
When I'm working with a storyboard I'm learnt that switching to a standalone ViewController requires an Identifier.
当我使用故事板时，我了解到切换到独立的 ViewController 需要一个标识符。
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
ViewController *myViewController = [storyboard instantiateViewControllerWithIdentifier:@"MyViewControllerIdentifier"];
[self presentViewController:myViewController animated:YES completion:nil];
How can I still use my custom initialization for myViewController while making use of a storyboard?
在使用情节提要的同时，如何仍然使用 myViewController 的自定义初始化？
Is it ok to just do something like this:
做这样的事情可以吗：
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
ViewController *myViewController = [storyboard instantiateViewControllerWithIdentifier:@"MyViewControllerIdentifier"];
myViewController.customData = myCustomData;
[self presentViewController:myViewController animated:YES completion:nil];
//MyViewController.m
- (id) initWithMyCustomData:(NSString *) data {
if (self = [super init]) {
iVarData = data;
}
return self;
}
采纳答案by carloabelli
I would just create a method which does the custom data loading.
我只想创建一个执行自定义数据加载的方法。
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
MyViewController *myViewController = [storyboard instantiateViewControllerWithIdentifier:@"MyViewControllerIdentifier"];
[myViewController loadCustomData:myCustomData];
[self presentViewController:myViewController animated:YES completion:nil];
If all your initWithCustomDatamethod does is set one instance variable, you should just set it manually (no custom inits or extra methods required):
如果你的initWithCustomData方法所做的只是设置一个实例变量，你应该手动设置它（不需要自定义初始化或额外的方法）：
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
MyViewController *myViewController = [storyboard instantiateViewControllerWithIdentifier:@"MyViewControllerIdentifier"];
myViewController.iVarData = myCustomData;
[self presentViewController:myViewController animated:YES completion:nil];
回答by Tahir Iqbal
You can instantiate viewcontroller in -init method.
您可以在 -init 方法中实例化视图控制器。
- (instancetype)init
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
self = [storyboard instantiateViewControllerWithIdentifier:@"MyViewController"];
if(self)
{
//default initialization
}
return self;
}
and the in your custom init method
并在您的自定义 init 方法中
- (instancetype)initWithImages:(NSArray *)images
{
self = [self init];
if(self)
{
self.images = images;
}
return self;
}
回答by Tash Pemhiwa
My version:
我的版本：
- (instancetype)initWithData (NSArray *)someData
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
self = [storyboard instantiateViewControllerWithIdentifier:@"MyViewController"];
if(self)
{
//default initialization
}
return self;
}
...one initializer ;)
...一个初始化程序;)
