OC-AutoLayout system UITableViewCell

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之前计算自定义返回cell 的高度，现在看来实在太费事，也太坑爹。直接上代码吧

step：创建一个cell

@interface YYDynamicCell_system : UITableViewCell@property(nonatomic,strong) id           object;@end

@implementation YYDynamicCell_system- (void)awakeFromNib {    // Initialization code}-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{    if (self = [super initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:reuseIdentifier]) {        self.textLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];        self.textLabel.numberOfLines = 0;        [self.textLabel setTranslatesAutoresizingMaskIntoConstraints:NO];        //        self.detailTextLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];        self.detailTextLabel.numberOfLines = 0;        self.detailTextLabel.textAlignment = NSTextAlignmentLeft;        [self.detailTextLabel setTranslatesAutoresizingMaskIntoConstraints:NO];        [self addConstraintsToContentview];    }    return self;}-(void)addConstraintsToContentview{    UIView *_conView = self.contentView;    UIView *_textLabel = self.textLabel;    UIView *_detailLabel = self.detailTextLabel;    NSDictionary *viewDict = NSDictionaryOfVariableBindings(_conView,_textLabel,_detailLabel);    NSDictionary *metrics = @{@"hPadding":@15,@"vPadding":@8};        NSMutableArray *contraints = [NSMutableArray array];        //method 01//    [contraints addObject:[NSLayoutConstraint constraintWithItem:_textLabel attribute:NSLayoutAttributeFirstBaseline relatedBy:NSLayoutRelationEqual toItem:self.contentView attribute:NSLayoutAttributeTop multiplier:1.0 constant:30]];//    [contraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[_textLabel]-vPadding-[_detailLabel]" options:0 metrics:metrics views:viewDict]];////    ////    [contraints addObject:[NSLayoutConstraint constraintWithItem:self.contentView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:_detailLabel attribute:NSLayoutAttributeLastBaseline multiplier:1.0 constant:10]];//    //这个不用////    [contraints addObject:[NSLayoutConstraint constraintWithItem:self.contentView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:0 multiplier:1 constant:44]];//    //////    [contraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hPadding-[_textLabel(_detailLabel)]-hPadding-|" options:0 metrics:metrics views:viewDict]];//    [contraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hPadding-[_textLabel]-hPadding-|" options:0 metrics:metrics views:viewDict]];////        [contraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hPadding-[_detailLabel]-hPadding-|" options:0 metrics:metrics views:viewDict]];//    [self.contentView addConstraints:contraints];    [contraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-vPadding-[_textLabel]-vPadding-[_detailLabel]-vPadding-|" options:0 metrics:metrics views:viewDict]];        [contraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hPadding-[_textLabel]-hPadding-|" options:0 metrics:metrics views:viewDict]];        [contraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hPadding-[_detailLabel]-hPadding-|" options:0 metrics:metrics views:viewDict]];    [self.contentView addConstraints:contraints];    }-(void)setObject:(id)object{    _object = object;    self.textLabel.text = [object objectForKey:@"title"];    self.detailTextLabel.text = [object objectForKey:@"detail"];}-(void)layoutSubviews{    [super layoutSubviews];    //preferredMaxLayoutWidth 这个是必须要添加的，否则可能会导致显示不正常    self.textLabel.preferredMaxLayoutWidth = self.contentView.bounds.size.width-20;    self.detailTextLabel.preferredMaxLayoutWidth = self.contentView.bounds.size.width-20;}- (void)setSelected:(BOOL)selected animated:(BOOL)animated {    [super setSelected:selected animated:animated];    // Configure the view for the selected state}@end

step2：在vc里面创建一个tableView，代理不用实现

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

    _tv = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];    [self.view addSubview:_tv];    _tv.dataSource = self;    _tv.delegate = self;    [_tv registerClass:[YYDynamicCell_system class] forCellReuseIdentifier:CellIdentifier];

// it is important    _tv.rowHeight = UITableViewAutomaticDimension;

其他应该就很好做了吧。。。ok

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