iOS 自訂cell的高度

iOS 自訂cell的高度

在iOS開發過程中,最重要的幾個UIView分別為UITableView、UIScrollView、UICollection.今天由小白哥帶大家認識一下UItableVIew

首先,建立一個Model類:

#import

@interface News : NSObject

@property (nonatomic,retain)NSString *title;

@property (nonatomic,retain)NSString *summary;

@end

News.m

#import "News.h"

@implementation News

- (void)dealloc

{

self.summary =nil;

self.title =nil;

[superdealloc];

}

//類中不存在與字典中key同名的屬性時,會執行這個方法,重寫該方法防治崩潰

- (void)setValue:(id)value forUndefinedKey:(NSString *)key

{

}

@end

開啟cell.h

#import

@class News;

@interface NewsListCell :UITableViewCell

@property (nonatomic,retain)News *news;

//

+ (CGFloat)cellHigth:(News *)news;

@end

開啟cell.m

#import "NewsListCell.h"

#import "News.h"

@interface NewsListCell ()

{

UILabel *_titleLabel;

UILabel *_summarylabel;

}

@end

@implementation NewsListCell

- (void)dealloc

{ self.news =nil;

[_summarylabelrelease];

[_titleLabel release];

[superdealloc];

}

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier

{

self = [superinitWithStyle:style reuseIdentifier:reuseIdentifier];

if (self) {

// Initialization code

[selfsetuoSubviews];

}

return self;

}

- (void)setuoSubviews

{

//標題

_titleLabel = [[UILabelalloc] initWithFrame:CGRectMake(20,10, 280, 40)];

_titleLabel.backgroundColor = [UIColoryellowColor];

_titleLabel.font = [UIFontsystemFontOfSize:20.0];

[self.contentViewaddSubview:_titleLabel];

//內容

_summarylabel = [[UILabelalloc] initWithFrame:CGRectMake(20,60, 280, 30)];

_summarylabel.backgroundColor = [UIColorcyanColor];

_summarylabel.font = [UIFontsystemFontOfSize:17.0];

_summarylabel.numberOfLines =0;

[self.contentViewaddSubview:_summarylabel];

}

- (void)setNews:(News *)news

{

if (_news != news) {

[_newsrelease];

_news = [news retain];

}

_titleLabel.text = news.title;

_summarylabel.text = news.summary;

//修改summmartlabel的高度

CGRect summaryrect = _summarylabel.frame;

summaryrect.size.height = [[selfclass] summaryheight:news.summary];

_summarylabel.frame = summaryrect;

}

//設定高度,根據傳入資料,計算當前行高

+ (CGFloat)cellHigth:(News *)news

{

//計算可變

CGFloat summaryHight = [selfsummaryheight:news.summary];

//返回不可變+keb

return 10 +40 + 10 + summaryHight +20;

}

//計算新聞內容 的高度(橫向或豎向固定)

+ (CGFloat)summaryheight:(NSString *)summary

{

//文本渲染時需要的矩行大小,按需求:寬度固定位280,高度設定為10000(即高度根據文本計算得到的)寬度與顯示文本的label的寬度有關(一樣大)

CGSize contextSize = CGSizeMake(280, 10000);

//計算時設定的字型大小,必須與顯示文本的label的字型大小保持一致

NSDictionary *attributes =@{NSFontAttributeName:[UIFontsystemFontOfSize:17.0]};//系統類別提供的字串.設定字型 (跟label有關 17)

CGRect summaryRect = [summaryboundingRectWithSize:contextSize options:NSStringDrawingUsesLineFragmentOriginattributes:attributes context:nil];

return summaryRect.size.height;//只需要其中一個

}

- (void)awakeFromNib

{

// Initialization code

}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated

{

[supersetSelected:selected animated:animated];

// Configure the view for the selected state

}

@end

開啟UITableViewController.m為:

//

// NewsListTableViewController.m

// Lesson11Cellhight

//

// Created by Dubai on 14-9-30.

// Copyright (c) 2014年 Dubai All rights reserved.

//

#import "NewsListTableViewController.h"

#import "NewsListCell.h"

#import "News.h"

#define kNewsCell @"NewsListCell"

@interface NewsListTableViewController ()

{

NSMutableArray *_newsArray;

}

@end

@implementation NewsListTableViewController

- (void)dealloc

{

[_newsArray release];

[superdealloc];

}

- (id)initWithStyle:(UITableViewStyle)style

{

self = [superinitWithStyle:style];

if (self) {

// Custom initialization

}

return self;

}

- (void)viewDidLoad

{

[superviewDidLoad];

NSString *filepath = [[NSBundlemainBundle] pathForResource:@"NewsData"ofType:@"plist"];

NSDictionary *sourceDic = [NSDictionarydictionaryWithContentsOfFile:filepath];

_newsArray = [[NSMutableArrayalloc] initWithCapacity:50];

NSArray *sourceArray = sourceDic[@"news"];

// NSLog(@"source array = %@",sourceArray);

//NSMutableArray *newsArray = [[NSMutableArray alloc] initWithCapacity:50];

for (NSDictionary *newsDicin sourceArray) {

News *news = [[Newsalloc] init];

[news setValuesForKeysWithDictionary:newsDic];

[_newsArrayaddObject:news];

[newsrelease];

}

NSLog(@"_newsArray = %@",_newsArray);

//註冊

[self.tableViewregisterClass:[NewsListCellclass] forCellReuseIdentifier:kNewsCell];

}

- (void)didReceiveMemoryWarning

{

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

if ([self isViewLoaded] && self.view.window ==nil ) {

self.view =nil;

}

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

// Return the number of sections.

//return [_newsArray count];

return 1;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

// Return the number of rows in the section.

return [_newsArraycount];

}

//設定行高限制性,設定cell後執行,即執行設定行高時 cell不存在對象;

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

{

//在cell類中計算,定義類的方法.傳入資料對象,返回計算後的高度

News *news = _newsArray[indexPath.row];

return [NewsListCellcellHigth:news];

//return 110;

}

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

{

//News *bnews = [[News alloc] init];

NewsListCell *cell = [tableViewdequeueReusableCellWithIdentifier:kNewsCellforIndexPath:indexPath];

News *anews = _newsArray[indexPath.row];

// cell.new = news.title;

// cell.new = news.summary;

//cell.news =bnews;

cell.news = anews;

return cell;

}

@end

我寫的這個 所有的資料卸載一個plist檔案裡是一個字典類型!大家可以建立一個試一下!