计算cell的高度和自动适配高度_cell的高度大小-优快云博客

本文链接：https://blog.youkuaiyun.com/macwcj/article/details/46575515

本文介绍了如何在UITableView中创建一个自定义的BoyCell，该细胞可以自动计算并设置内部UILabel的高度，根据Person对象的内容动态调整。通过实现计算文字高度的方法`calcHeightWithPerson:`，并调用`cellHeightWithPerson:`来获取整个cell的高度。

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#import "BoyCell.h"
#import "Person.h"

@implementation BoyCell


- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        [self addAllViews];
    }
    return self;
}

#pragma mark - 添加全部控件
- (void)addAllViews
{
#define kMargin 10
#define kWidth 150
#define kHeight 35
    
    self.nameLabel = [[[UILabel alloc] initWithFrame:CGRectMake(kMargin, kMargin, kWidth, kHeight)] autorelease];
    [self.contentView addSubview:_nameLabel];
    
    self.phoneLabel = [[[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(_nameLabel.frame) + kMargin, kMargin, kWidth, kHeight)] autorelease];
    [self.contentView addSubview:_phoneLabel];
    
    self.genderLabel = [[[UILabel alloc] initWithFrame:CGRectMake(kMargin, CGRectGetMaxY(_nameLabel.frame) + kMargin, kWidth, kHeight)] autorelease];
    [self.contentView addSubview:_genderLabel];
    
    self.ageLabel = [[[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(_genderLabel.frame) + kMargin, _genderLabel.frame.origin.y, kWidth, kHeight)] autorelease];
    [self.contentView addSubview:_ageLabel];
    
    self.introduceLabel = [[[UILabel alloc] initWithFrame:CGRectMake(kMargin, CGRectGetMaxY(_genderLabel.frame) + kMargin, self.frame.size.width - kMargin * 2, kHeight * 2)] autorelease];
    _introduceLabel.numberOfLines = 0;
    [self.contentView addSubview:_introduceLabel];
    
    
//    for (UILabel *label in self.contentView.subviews) {
//        label.backgroundColor = [UIColor cyanColor];
//    }
}

#pragma mark 重写Person的setter方法
- (void)setPerson:(Person *)person
{
    if (_person != person) {
        [_person release];
        _person = [person retain];
        
        // 获取值，并放到Label上显示
        _nameLabel.text = person.name;
        _phoneLabel.text = person.phoneNumber;
        _genderLabel.text = person.gender;
        _ageLabel.text = [NSString stringWithFormat:@"%ld", person.age];
        _introduceLabel.text = person.introduce;
        
        
        // 根据文字计算高度
        CGFloat height = [self calcHeightWithPerson:person];
        
        CGRect frame = _introduceLabel.frame;
        frame.size.height = height;
        _introduceLabel.frame = frame;
    }
}

#pragma mark 计算文字高度
- (CGFloat)calcHeightWithPerson:(Person *)person
{
    CGSize size = CGSizeMake(_introduceLabel.frame.size.width, 2000);
    NSDictionary *dict = @{
                           NSFontAttributeName : _introduceLabel.font
                           };
    /*
     1.在这个大小范围内进行计算
     2.计算高度需要的枚举值
     3.字典，包含文字的字体大小
     4.上下文对象，此处设置为空
     */
    CGRect rect = [person.introduce boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];
    
    return rect.size.height;
}

#pragma mark 根据person计算出celld高度
+ (CGFloat)cellHeightWithPerson:(Person *)person
{
    // 创建一个当前类的对象，用来使用上面计算高度的方法
    BoyCell *boyCell = [[BoyCell new] autorelease];
    // 通过方法，计算出自我介绍的高度
    CGFloat height = [boyCell calcHeightWithPerson:person];
    // 返回整个cell的高度
    return height + 110;
}



- (void)awakeFromNib {
    
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    
}

#pragma mark - 重写
#pragma mark dealloc
- (void)dealloc
{
    [_nameLabel release];
    [_phoneLabel release];
    [_genderLabel release];
    [_ageLabel release];
    [_introduceLabel release];
    
    [_person release];
    
    [super dealloc];
}