iOS － UITableView加载网络图片 cell适应图片高度
使用xib创建自定制cell 显示图片 创建一个继承UITableViewCell的类 勾选xib
如下是xib创建图
xib
向.h拖拽一个关联线
.h
.m
2.代码创建(使用三方适配库进行适配Masonry三方代码适配)
.h
#import <UIKit/UIKit.h>
@interface NFTrailerNextTableViewCell : UITableViewCell
@property (nonatomic, strong) UIButton *imageBtn;
@end
.m
#import "NFTrailerNextTableViewCell.h"
@implementation NFTrailerNextTableViewCell
- (void)awakeFromNib {
[super awakeFromNib];
// Initialization code
}
- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
[self.contentView addSubview:self.imageBtn];
[self.imageBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.offset(0);
make.top.offset(0);
make.right.offset(0);
make.bottom.offset(-10);
}];
}
return self;
}
- (UIButton *)imageBtn {
if (nil == _imageBtn) {
_imageBtn = [[UIButton alloc] init];
_imageBtn.userInteractionEnabled = NO;
}
return _imageBtn;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
@end
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
//self.dataArr.count
return self.imagearr.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
NFTrailerNextTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([NFTrailerNextTableViewCell class])];
[self configureCell:cell atIndexPath:indexPath];
cell.userInteractionEnabled = NO;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;
}
//加载图片
- (void)configureCell:(NFTrailerNextTableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
NSString *imgURL = self.imagearr[indexPath.row];
UIImage *cachedImage = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:imgURL];
if ( !cachedImage ) {
[self downloadImage:self.imagearr[indexPath.row] forIndexPath:indexPath];
[cell.imageBtn setBackgroundImage:[UIImage imageNamed:@"国投互联"] forState:UIControlStateNormal];
} else {
[cell.imageBtn setBackgroundImage:cachedImage forState:UIControlStateNormal];
}
}
- (void)downloadImage:(NSString *)imageURL forIndexPath:(NSIndexPath *)indexPath {
// 利用 SDWebImage 框架提供的功能下载图片
[[SDWebImageDownloader sharedDownloader] downloadImageWithURL:[NSURL URLWithString:imageURL] options:SDWebImageDownloaderUseNSURLCache progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
} completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
[[SDImageCache sharedImageCache] storeImage:image forKey:imageURL toDisk:YES completion:^{
}];
dispatch_async(dispatch_get_main_queue(), ^{
[self.NFTableView reloadData];
});
}];
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
// 先从缓存中查找图片
UIImage *image = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:self.imagearr[indexPath.row]];
// 没有找到已下载的图片就使用默认的占位图，当然高度也是默认的高度了，除了高度不固定的文字部分。
if (!image) {
image = [UIImage imageNamed:@"国投互联"];
}
//手动计算cell
CGFloat imgHeight = image.size.height * [UIScreen mainScreen].bounds.size.width / image.size.width;
return imgHeight;
}
这样就可以了再见
