如何使用xib文件为自定义UIView类编写init方法 [英] How to write init method for custom UIView class with xib file

问题描述

我使用界面构建器创建了简单的视图.此视图有一个标签.你知道如何为这个类创建 init 方法吗?我写了自己的版本，但我不确定它是否正确.

I have created simple view using interface builder. This view has one label. Do you know how to create init method for this class ? I wrote my own version but I am not sure that it is correct or not.

@interface AHeaderView ()
@property (nonatomic, weak) IBOutlet UILabel *descriptionLabel;

@end

@implementation AHeaderView

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // add subview from nib file
        NSArray *nibContents = [[NSBundle mainBundle] loadNibNamed:@"AHeaderView" owner:nil options:nil];

        AHeaderView *plainView = [nibContents lastObject];
        plainView.descriptionLabel.text = @"localised string";
        [self addSubview:plainView];
    }
    return self;
}

-------------------------------- 版本 2 ---------------------------------

-------------------------------- version 2 ---------------------------------

@interface AHeaderView ()
@property (nonatomic, weak) IBOutlet UILabel *descriptionLabel;

@end

@implementation AHeaderView

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        self.descriptionLabel.text = @"localised string"
    }
    return self;
}

在 ViewController 类中加载:

loading in ViewController class:

NSArray *nibContents = [[NSBundle mainBundle] loadNibNamed:@"AHeaderView" owner:nil options:nil];
AHeaderView *headerView = [nibContents lastObject];

------- 版本 3 -------

------- version 3 -------

@interface AHeaderView ()
@property (nonatomic, weak) IBOutlet UILabel *descriptionLabel;

@end

@implementation AHeaderView

- (void)awakeFromNib {
    [super awakeFromNib];
    self.descriptionLabel.text = @"localised string"
}

@end

推荐答案

从 XIB 加载视图时 initWithFrame: 不会被调用.相反，方法签名应该是 - (id)initWithCoder:(NSCoder *)decoder.

When loading a view from an XIB initWithFrame: won't be called. Instead the method signature should be - (id)initWithCoder:(NSCoder *)decoder.

在这种情况下，您不应在单元方法中加载 NIB.其他一些类应该从 NIB 加载视图(如控制器类).

In this case you shouldn't be loading the NIB in your unit method. Some other class should be loading the view from the NIB (like a controller class).

您当前拥有的结果是一个没有标签集的视图，它有一个带有标签(带有一些文本)的子视图.

What you have currently results in a view with no label set which has a subview with a label (with some text).

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