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我在我必須加載在表視圖以下項目的分配無法查看自定義標籤中的UITableViewCell
- 圖片
- 標題
- 說明
的頁腳視圖是一個簡單的水平黑色約5分的規則。
但只有圖像可見，但不是標題和描述。不知何故，其他視圖被圖像視圖遮擋。
我定製的tableview單元實現
#import <UIKit/UIKit.h>
@interface MeowFestTableViewCell : UITableViewCell
@property (strong, nonatomic) IBOutlet UILabel *titleLabel;
@property (strong, nonatomic) IBOutlet UILabel *descriptionLabel;
@property (strong, nonatomic) IBOutlet UIImageView *imageView;
@end
和實現
#import "MeowFestTableViewCell.h"
@implementation MeowFestTableViewCell
- (void)awakeFromNib {
[super awakeFromNib];
// Initialization code
}
- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
}
return self;
}
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
@end
我的視圖控制器
#import "MeowFestViewController.h"
#import "MeowFestTableViewCell.h"
@interface MeowFestViewController()
@property (nonatomic, assign) NSInteger page;
@property (nonatomic, strong) NSMutableArray* feedItems;
@property (nonatomic, strong) NSMutableData* responseData;
@property (nonatomic, assign) CGPoint currentOffset;
@property (strong, nonatomic) IBOutlet UITableView *tableView;
@end
@implementation MeowFestViewController
-(void) awakeFromNib {
[super awakeFromNib];
}
-(void) loadView {
[super loadView];
// Force load.
UIView* view = self.view;
self.page = 0;
self.currentOffset = CGPointZero;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.tableView setDelegate:self];
[self.tableView setDataSource:self];
self.meowFestProtocolDelegate = self;
[self.meowFestProtocolDelegate getTheFeed:self.page];
}
#pragma mark - MeowFestProtocol
-(void) getTheFeed:(NSInteger) page {
NSString* url =
[NSString stringWithFormat:@"https://chex-triplebyte.herokuapp.com/api/cats?page=%d", self.page];
NSURL* nsUrl = [[NSURL alloc] initWithString:url];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:nsUrl];
[request setHTTPMethod:@"GET"];
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *task = [session dataTaskWithRequest:request
completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) {
self.feedItems = [NSJSONSerialization JSONObjectWithData: data
options: NSJSONReadingMutableContainers error: &error];
[self.tableView reloadData];
dispatch_semaphore_signal(semaphore);
}];
[task resume];
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
}
#pragma Table Arguments.
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.feedItems count] + 1; // (10 items + 1 button)
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(nonnull NSIndexPath *)indexPath {
if (indexPath.row == 10) {
return 50.0f;
}
return 300.0f;
}
-(UIView*) tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
UIView* footerView =
[[UIView alloc] initWithFrame:CGRectMake(
0, 0, CGRectGetWidth(self.view.bounds), 5)];
[footerView setBackgroundColor:[UIColor blackColor]];
return footerView;
}
-(CGFloat)
tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
return 5.0f;
}
-(UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row != 10) {
MeowFestTableViewCell* tableViewCell = (MeowFestTableViewCell*)[tableView dequeueReusableCellWithIdentifier:@"meowFestCell"];
if (tableViewCell == nil) {
tableViewCell = [[MeowFestTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"meowFestCell"];
}
NSDictionary* dict = (NSDictionary*) [self.feedItems objectAtIndex:(self.page * 10 + indexPath.row)];
// Initialise the data.
tableViewCell.titleLabel.text = (NSString*) [dict objectForKey:@"title"];
[tableViewCell.titleLabel sizeToFit];
tableViewCell.descriptionLabel.text = (NSString*) [dict objectForKey:@"description"];
[tableViewCell.descriptionLabel sizeToFit];
UIImage* catImage =
[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[dict objectForKey:@"image_url"]]]];
tableViewCell.imageView.image = catImage;
return tableViewCell;
} else {
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"loadMoreCell"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"loadMoreCell"];
}
cell.backgroundColor = [UIColor colorWithRed:0.50 green:0.00 blue:0.50 alpha:1.0];
return cell;
}
}
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// rows in section 0 should not be selectable
if (indexPath.row == 10) {
return indexPath;
}
return nil;
}
- (void) scrollViewDidScroll:(UIScrollView *)scrollView {
CGPoint offset = scrollView.contentOffset;
CGSize size = scrollView.contentSize;
if (abs(size.height - offset.y) < 10) {
self.currentOffset = offset;
} else if (offset.y < self.currentOffset.y) {
if (offset.y == 0) {
self.page = 0;
self.currentOffset = CGPointZero;
}
}
}
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == [self.feedItems count]) {
[self.meowFestProtocolDelegate getTheFeed:(self.page + 1)];
self.page = self.page + 1;
[self.tableView reloadData];
}
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
在模擬器的輸出如下
UPDATE
給我嘗試添加缺少約束每@ vadian的建議，但是這個選項被禁用我。
和
更新＃2：@ vadian的設置既UILabels作品的高度限制，但有沒有辦法不用硬編碼UILabels的高度？我通過創建API調用來獲取內容，所以我無法控制返回的文本。文本可以儘可能長。我已經設置了行數= 0，而換行符模式= Word Break。
給底部約束描述標籤，你會得到錯誤然後通過Xcode的校正解決錯誤。 – KKRocks
嗨，我已經定義了描述標籤的約束。現在，superview.bottom = descriptonLabel.bottom + 35和descriptionlabel.top = titleLabel.bottom + 35 – Kartik
那麼爲什麼會顯示約束警告。 – KKRocks