自定义 cell 自适应高度
#import "CommodityCell.h"
#import "UIImageView+WebCache.h"
@implementation CommodityCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
[self addAllViews];
}
return self;
}
#pragma mark 加载全部控件
- (void)addAllViews
{
// 图片
self.photoImageView = [[[UIImageView alloc] initWithFrame:CGRectMake(kMargin, kMargin, kWidth, kWidth)] autorelease];
_photoImageView.backgroundColor = [UIColor clearColor];
[self.contentView addSubview:_photoImageView];
// 标题
self.titleLabel = [[[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(_photoImageView.frame) + kMargin, kMargin, 225, kWidth / 2 - 10)] autorelease];
_titleLabel.backgroundColor = [UIColor clearColor];
_titleLabel.font = [UIFont boldSystemFontOfSize:17];
[self.contentView addSubview:_titleLabel];
_titleLabel.numberOfLines = 0;
// 详情
self.introduceLabel = [[[UILabel alloc] initWithFrame:CGRectMake(140, CGRectGetMaxY(_titleLabel.frame) + kMargin, 225, kWidth / 2)] autorelease];
_introduceLabel.backgroundColor = [UIColor clearColor];
_introduceLabel.numberOfLines = 0;
[self.contentView addSubview:_introduceLabel];
// 关闭交互
self.contentView.userInteractionEnabled = NO;
}
#pragma mark - 计算模型内某个字符串的高度
+ (CGFloat)calsLabelHeightWithCommodity:(Commodity *)commodity
{
// size: 表示允许文字所在的最大范围
// options: 一个参数，计算高度是使用 NSStringDrawingUsesLineFragmentOrigin
// attribute: 表示文字的某个属性(通常是文字大小)
// context: 上下文对象，通常写nil
CGRect rect = [commodity.Descripition boundingRectWithSize:CGSizeMake(225, 500) options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:17]}
context:nil];
return rect.size.height;
}
#pragma mark 使用模型方法，返回模型内容在自己内部显示应该的高度
+ (CGFloat)cellHeightWithCommodity:(Commodity *)commodity
{
CGFloat a = 50 + 3 * kMargin + [self calsLabelHeightWithCommodity:commodity];
CGFloat b = kMargin + kWidth; // 图片的高度
if (a < b) {
return b;
} else {
return a;
}
}
#pragma mark 重写 commodity的setter方法
- (void)setCommodity:(Commodity *)commodity
{
NSLog(@"%@", commodity.Descripition);
if (_commodity != commodity) {
[_commodity release];
_commodity = [commodity retain];
}
//1.标题
self.titleLabel.text = _commodity.title;
//2.1 自适应高度
CGRect frame = _introduceLabel.frame;
frame.size.height = [CommodityCell calsLabelHeightWithCommodity:_commodity];//调整高度
_introduceLabel.frame = frame;
//2.2显示文字
self.introduceLabel.text = _commodity.Descripition;
//3. SDWebImage 异步加载图片
[self.photoImageView sd_setImageWithURL:[NSURL URLWithString:_commodity.s_image_url]];
}
