tableViewCell 中的编程 NSLayoutconstraints 问题

Question

我不断收到奇怪的约束错误，并且我的单元格中的视图不显示，下面是单元格类和错误日志。

我的表格视图单元格类

#import "TableViewCell.h"

@implementation TableViewCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {

self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
    
    self.translatesAutoresizingMaskIntoConstraints = NO;
    
    self.recipeImageView = [UIImageView new];
    self.recipeImageView.image = [UIImage imageNamed:@"imagePickerBackground"];
    self.recipeImageView.layer.cornerRadius = 20;
    self.recipeImageView.layer.borderColor = [[UIColor blackColor]CGColor];
    self.recipeImageView.layer.borderWidth = 1;
    self.recipeImageView.layer.masksToBounds = YES;
    [self addSubview:self.recipeImageView];
    
    self.descriptionLabel = [UILabel new];
    self.descriptionLabel.text = @"description";
    self.descriptionLabel.font = [UIFont fontWithName:@"Chalkduster" size:12];
    self.descriptionLabel.textColor = [UIColor blackColor];
    self.descriptionLabel.layer.cornerRadius = 20;
    self.descriptionLabel.layer.borderWidth = 1;
    self.descriptionLabel.layer.masksToBounds = YES;
    self.descriptionLabel.layer.borderColor = [[UIColor blackColor]CGColor];
    [self addSubview:self.descriptionLabel];
    
    NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(_descriptionLabel, _recipeImageView);
    
    NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[_recipeImageView]-10-|" options:0 metrics:nil views:viewsDictionary];
    
//        NSArray *constraintsTwo = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[_recipeImageView]-10-|" options:0 metrics:nil views:viewsDictionary];
    
    NSLayoutConstraint *equalConstraint = [NSLayoutConstraint constraintWithItem:self.descriptionLabel attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.recipeImageView attribute:NSLayoutAttributeWidth multiplier:1 constant:0];
    
    NSArray *verticalConstrains = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[_recipeImageView(==200)]-10-[_descriptionLabel(==70)]-10-|" options:0 metrics:nil views:viewsDictionary];
    
    [self addConstraints:constraints];
//        [self addConstraints:constraintsTwo];
    [self addConstraints:verticalConstrains];
    [self addConstraint:equalConstraint];
    
}

return self;
}

@end

这里是视图控制器中的编程注册方法（表视图的数据源和委托）

在视图中确实加载了

- (void)viewDidLoad {
[super viewDidLoad];

self.tableView = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStyleGrouped];
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self registerTableView:self.tableView];
[self.view addSubview:self.tableView];

[self.tableView reloadData]; 

[self setUpNavigationBar];

}

注册方法

- (void)registerTableView:(UITableView *)tableView {

[tableView registerClass:[TableViewCell class] forCellReuseIdentifier:@"cell"];

}

索引路径处的行单元格

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

return cell; 

}

行高（设置为 300）

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

return 300;
}

错误日志（它不会崩溃，所以我不能设置断点）

2015-10-26 15:22:05.524 食谱日记[33894:1375043] 无法 同时满足约束。可能至少其中之一 以下列表中的约束是您不想要的。试试这个：（1） 查看每个约束并尝试找出您不期望的约束； (2) 找到添加了不需要的约束的代码 并修复它。 （注：如果你看到 NSAutoresizingMaskLayoutConstraints 你不明白的，参考 到 UIView 属性的文档 translatesAutoresizingMaskIntoConstraints) ( "<0x7f7f53eca790 h="--&" v="--&" uiimageview:0x7f7f53ecebd0.midx="="><0x7f7f53ecfb90 h:>

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Answer 1

我想通了

而不是

self.translatesAutoresizingMaskIntoConstraints = NO;

应该是

self.recipeImageView.translatesAutoresizingMaskIntoConstraints = NO;
self.descriptionLabel.translatesAutoresizingMaskIntoConstraints = NO;