ios拓展2-Cell的层级关系

tableViewCell 内部层级关系, 主要就是 cell和cell.contentView的区别

#import "YYOrderCell.h"

@implementation YYOrderCell

- (instancetype)init{
    if (self = [super init]) {
        [self setupUI];
        NSLog(@"1");
    }
    return self;
}

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
    NSLog(@"2");
    return [super initWithStyle:style reuseIdentifier:reuseIdentifier];
}

- (void)setupUI{
    
    UIImageView *pic = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 100, 100)];
    pic.backgroundColor = [UIColor grayColor];
    
    UITextView *viewtext = [[UITextView alloc] initWithFrame:CGRectMake(200, 10, 100, 100)];
    viewtext.backgroundColor = [UIColor grayColor];
    
    self.backgroundColor = [UIColor blueColor];
    self.contentView.backgroundColor = [UIColor redColor];
    
    // contentView 和 直接添加到cell的区别
    [self.contentView addSubview:pic];
    [self addSubview:viewtext];

//   self.backgroundView  反正我是没用到过
    NSLog(@"%@",self.backgroundView);//=======>结果为 空
    
}
@end

contentView 和 直接添加到cell的区别 init和initWithStyle调用顺序