Question

我试图在长时间的休息之后接手奥杰-C和皮涅茨,因此,Im 重读Apress 起点-3发展。

现在,我 struggl辛地争取在以下几个方面发挥领导作用:

#import "BlueViewController.h"

............

@synthesize blueViewController;

......

- (void)viewDidLoad {
    BlueViewController *blueController = [[BlueViewController alloc]
                            initWithNibName:@"BlueView" bundle:nil];

    self.blueViewController = blueController;

    [self.view insertSubview:blueController.view atIndex:0];

    //Why don t we use the following instead of the above?
    //[self.view insertSubview:self.blueViewController.view atIndex:0]?

    [blueController release];
    [superViewDidLoad];
}

对我来说,似乎更合乎逻辑的是,由于我们刚刚指定了蓝色主计长来自食其力,我们应当使用后者而不是前者。例子背后的理由是什么? 我的错误是什么?

Answer 1

It comes down to clarity. Write the code that you find most readable.

I tend towards:

.h file

@property (nonatomic, retain) BlueViewController *blueController;

.m file

@synthesize blueController=_blueController;

and

- (void)viewDidLoad {
    _blueController = [[BlueViewController alloc]
                            initWithNibName:@"BlueView" bundle:nil];

    [self.view insertSubview:self.blueController.view atIndex:0];
    [superViewDidLoad];
}

That _ helps me helps me keep track of direct variable access (_blueController) versus access as a property (self.blueController).

Answer 2

They re both pointing to the same reference. No difference, really. Your approach works as well.

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