iOS AutoLayout: 关联 Xib 和 UIView

博客 iOS AutoLayout: 关联 Xib 和 UIViewController 介绍了 UIViewController 如何关联 xib 文件, 并且如何给组件连线以及一些需要注意的事项.

今天继续 Autolayout 的话题.

1.新建一个 Single View 的 iOS 项目

2.新建一个 Empty 的 Userinterface View, 取名为 View.xib

3.新建一个继承自 UIView 的子类, 取名为 CustomView.

4.打开 View.xib, 选择 File Owner 为 CustomView.

如下图所示

在 ViewController 的 viewDidload 加入下面代码:

CustomView *cv = [[CustomView alloc] init];    UIView *view = [[[NSBundle mainBundle] loadNibNamed:@"View" owner:cv options:nil] firstObject];    view.frame = self.view.bounds;    [self.view addSubview:view];

编译运行, 即可看到效果.

CustomView 实现

#import "CustomView.h"@interface CustomView ()@property (nonatomic, strong) UIView *nibView;@end@implementation CustomView- (instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        _nibView = [[[NSBundle mainBundle] loadNibNamed:@"View" owner:self options:nil] firstObject];        _nibView.frame = frame;        [self addSubview:_nibView];    }    NSLog(@"CustomView: initWithFrame...");    return self;}- (instancetype)initWithCoder:(NSCoder *)coder{    self = [super initWithCoder:coder];    if (self) {    }    NSLog(@"CustomView: initWithCoder...");    return self;}- (void)awakeFromNib{    [super awakeFromNib];    NSLog(@"CustomView: awakeFromNib...");}//重写该方法- (void)layoutSubviews{    [super layoutSubviews];    self.nibView.frame = self.frame;}//重写该方法- (void)setFrame:(CGRect)frame{    _nibView.frame = frame;    [super setFrame:frame];}

修改 ViewController 中 viewDidload 方法:

#if 0    //方式 1    CustomView *cv = [[CustomView alloc] init];    UIView *view = [[[NSBundle mainBundle] loadNibNamed:@"View" owner:cv options:nil] firstObject];    view.frame = self.view.bounds;    [self.view addSubview:view];#endif    // 方式2    //CustomView *customView = [[CustomView alloc] initWithFrame:self.view.bounds];    // 方式3    CustomView *customView = [[CustomView alloc] init];    customView.frame = self.view.bounds;    [self.view addSubview:customView]

无论在 ViewController 中使用哪种方式来加载视图, 都是调用视图的 initWithFrame 方法.不是 initWithCoder.

下篇博客继续 UIView 和 Xib 的话题, 我会使用另一种加载和设计方式.

收工!