1、代码加载

代码加载的方式对于view模块分块加载方便简单多了，也有利于团队的协作和维护

@interface ViewWithoutXib : UIView

//类方法加载 -- 初始化方法在其中
+(instancetype)initWithFrame:(CGRect)frame withTitle:(NSString *)title;

@end

@interface ViewWithoutXib()

@property (nonatomic , strong) UILabel * titleLB;

@end

@implementation ViewWithoutXib

+(instancetype)initWithFrame:(CGRect)frame withTitle:(NSString *)title{
    return [[self alloc] initWithFrame:frame withTitle:title];
}

//初始化
-(instancetype)initWithFrame:(CGRect)frame withTitle:(NSString *)title{
    self = [super initWithFrame:frame];
    if (self) {
        [self initView:title];
    }
    return self;
}
//加载控件
-(void)initView:(NSString *)title{
    self.backgroundColor = [UIColor yellowColor];
    self.titleLB.text = title;
}


#pragma getter and setter

-(UILabel *)titleLB{
    if (_titleLB == nil) {
        _titleLB = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, self.frame.size.width - 20, self.frame.size.height)];
        [self addSubview:_titleLB];
    }
    return _titleLB;
}

2、xib加载

xib加载相对而言，在构建页面上比较方便，做起来比较块，但是对应的注意的点也比较多。

新建UIView，Xcode新建UIView不能同时关联xib ,需要自己再新建xib文件进行关联

新建View.jpg
xib界面File's owner处为空（不同于ViewController）,customClass的class处填写view的类名

File's owner.jpg
Class.jpg

2018.06.12新增
设置 frame大小时，实际运行时发现高度没有固定，是Autoresizing的设置问题（纵向设置不需要设置）

Autoresizing.png

初始化
加载xib文件,进行关联

- (nullable NSArray *)loadNibNamed:(NSString *)name owner:(nullable id)owner options:(nullable NSDictionary *)options;

控件加载

@interface ViewWithXib : UIView

+(instancetype)initWithXib:(CGRect)frame withTile:(NSString *)title;

@end

@implementation ViewWithXib

+(instancetype)initWithXib:(CGRect)frame withTile:(NSString *)title{
    ViewWithXib *view = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:self options:nil].lastObject;
    view.frame = frame;
    view.title = title;
    [view awakeFromNib];

    return view;
}

//1、正在准备初始化 -- loadNibName 之后会调用
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        
    }
    return self;
}
//2、初始化完毕`（若想初始化时做点事情，最好在这个方法里面实现）`
- (void)awakeFromNib {
    [super awakeFromNib];
    
     self.titleLB.text = self.title;
}

@end

运行结果