1.創(chuàng)建UIView
2.在UIView.h中創(chuàng)建兩個(gè)屬性

@property UILabel *aLabel;
@property UITextField *textField;

3.在UIView.m中重寫(xiě)初始化方法.創(chuàng)建新方法

//重寫(xiě)初始化方法
- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
       
        [self setLabel];
        [self setTextField];
    }
    return self;
}
//模塊化創(chuàng)建label
//野指針 就是沒(méi)有指向確定空間的指針
- (void)setLabel {
    _aLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 10, 100, 40)];
    _aLabel.backgroundColor = [UIColor brownColor];
    _aLabel.textColor = [UIColor cyanColor];
    [self addSubview:_aLabel];
}
- (void)setTextField{
    _textField = [[UITextField alloc]initWithFrame:CGRectMake(130, 10, 250, 40)];
    _textField.borderStyle = UITextBorderStyleRoundedRect;//默認(rèn)白色
    _textField.clearButtonMode = UITextFieldViewModeAlways;
    [self addSubview:_textField];
}

4.在RootViewController.m的viewDidLoad中調(diào)用LTView

 LTView *aView = [[LTView alloc]initWithFrame:CGRectMake(10, 50, 390, 60)];
    aView.backgroundColor = [UIColor yellowColor];
    aView.aLabel.text = @"賬號(hào)";
    aView.textField.placeholder = @"請(qǐng)輸入賬號(hào)";
    [self.view addSubview:aView];