XIB / Story Board / OC纯代码创建(alloc)+初始化(init)

最新推荐文章于 2020-06-07 22:17:05 发布

原创最新推荐文章于 2020-06-07 22:17:05 发布 · 686 阅读

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本文介绍了iOS中视图的几种加载方式，包括使用XIB文件加载、纯代码初始化及Storyboard加载，并展示了如何通过不同方法创建和配置UIView及UIViewController实例。

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1.View:

XIB:

+ (instancetype)loadFromNib {
    NSString *myclass = NSStringFromClass([self class]);
    // 封装Xib的加载过程
    return [[NSBundle mainBundle] loadNibNamed:myclass owner:nil options:nil].firstObject;
}
- (void)awakeFromNib {
    [super awakeFromNib];
    // add Initialization code
}
//调用
[xxx loadFromNib];

OC纯代码:

-(id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        //add init code
    return self;
}
//调用
[[xxx alloc] initWithFrame:...];

2.NSObject

OC纯代码:

- (instancetype)initWithxxx:(xxx)xxx  {
    self = [super init];
    if (self) {
        //add init code;
    }
    return self;
}
//调用
[[xxx alloc] initWithxxx:...];

//单例
+ (instancetype)sharedInstance {
    static ClassName *className;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        className = [[ClassName alloc] init];
    });
    return className;
}
//如果作为父类
+ (instancetype)sharedInstance {
    id instance = objc_getAssociatedObject(self, @"instance");
    if (!instance) {
        instance = [[super allocWithZone:NULL] init];
        objc_setAssociatedObject(self, @"instance", instance, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }
    return instance;
}
//调用
[xxx sharedInstance];

3.ViewController

Story Board:

<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:<#@"Nib name"#> bundle:nil];
// Pass the selected object to the new view controller.
// Push the view controller.
[self.navigationController pushViewController:detailViewController animated:YES];

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}