iOS UILabel根据文字获取高度及UITableCell动态获取高度（以截取快递信息为例）

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

#import "AppDelegate.h"

#import "RootViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    self.window.rootViewController = [[RootViewController alloc] init];

    [self.window makeKeyAndVisible];

    return YES;

}

@end

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"

#define cellWidth  [UIScreen mainScreen].bounds.size.width

@interface RootViewController ()<UITableViewDataSource,UITableViewDelegate>

{

//    NSMutableArray *dateArr;

    NSMutableArray *timeArr;// 时间

    NSMutableArray *messsgeArr; // 物流信息

    UITableView * _tableView;

}

@end

@implementation RootViewController

- (void)viewDidLoad {

    [super viewDidLoad];

//    self.view.backgroundColor = [UIColor lightGrayColor];

//    dateArr = [[NSMutableArray alloc] init];

    timeArr = [[NSMutableArray alloc] init];

    messsgeArr = [[NSMutableArray alloc] init];

    _tableView = [[UITableView alloc] initWithFrame:CGRectMake(, , cellWidth, [UIScreen mainScreen].bounds.size.height - ) style:UITableViewStylePlain];

    _tableView.delegate = self;

    _tableView.dataSource = self;

    _tableView.backgroundColor = [UIColor lightGrayColor];

    [self.view addSubview:_tableView];

    //去掉多余的cell

    _tableView.tableFooterView = [[UIView alloc] init];

    // 请求数据并进行处理

    [self dealWithExpressMessage];

}

- (void)dealWithExpressMessage{

    NSString *htmlString = @"http://wap.kuaidi100.com/wap_result.jsp?rand=20120517&id=zhongtong&fromWeb=null&&postid=718969747957";

    NSString *dataString = [NSString stringWithContentsOfURL:[NSURL URLWithString:htmlString] encoding:NSUTF8StringEncoding error:nil];

    NSData *htmlData = [dataString dataUsingEncoding:NSUTF8StringEncoding];

    NSString *string = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding];

    NSArray * array = [string componentsSeparatedByString:@"<p>&middot"];

    // 分割后，获取有用的信息

    NSMutableArray *mArr = [[NSMutableArray alloc] init];

    for (int i = ; i < array.count; i++ ) {

        if ((i != ) && (i != array.count - )) {

            [mArr addObject:array[i]];

        }

        if (i == array.count -) {

            NSArray *newArr = [array[i] componentsSeparatedByString:@"</form>"];

            NSString *string = newArr[];

            [mArr addObject:string];

        }

    }

    // 将获取到的数据分开

    for (NSString *subString in mArr) {

        NSArray *array = [subString componentsSeparatedByString:@"<br />"];

        NSString *timeString = array[];

        NSArray *dateArray = [timeString componentsSeparatedByString:@";"];

        [timeArr addObject:dateArray[]];

        /*  将年月日与时分秒的时间分开

        NSArray *spaTimeArr = [timeString componentsSeparatedByString:@" "];

        NSArray *dateArray = [spaTimeArr[0] componentsSeparatedByString:@";"];

        // 获取年月日的时间

        [dateArr addObject:dateArray[1]];

        //获取时分秒的时间

        [timeArr addObject:spaTimeArr[1]];

        */

//        NSLog(@" == %@",dateArray[1]);

        NSString *address = array[];

        NSArray *addressArr = [address componentsSeparatedByString:@"</p>"];

        // 存放快递的信息

        NSString *newString = [addressArr[] stringByReplacingOccurrencesOfString:@" " withString:@""];

        [messsgeArr addObject:newString];

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

    }

//    NSLog(@"===== %@",messsgeArr);

}

#pragma mark -- tableView 的数据配置 --

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

    return ;

}

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

    return timeArr.count;

}

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

{

    UITableView *cell = [self tableView:tableView cellForRowAtIndexPath:indexPath];

    return cell.frame.size.height;

}

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

    static NSString *identifier = @"cell";

    tableView.separatorStyle = UITableViewCellSelectionStyleNone;

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];

    if (cell == nil) {

        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];

    }

    cell.userInteractionEnabled = NO;

    for (UIView *subView in cell.subviews) {

        [subView removeFromSuperview];

    }

    cell.backgroundColor = [UIColor lightGrayColor];

    UILabel *timeLabel = [[UILabel alloc] initWithFrame:CGRectMake(, , cellWidth, )];

    timeLabel.textColor = [UIColor blueColor];

    timeLabel.font = [UIFont systemFontOfSize:];

    timeLabel.backgroundColor = [UIColor clearColor];

    [cell addSubview:timeLabel];

    timeLabel.text = timeArr[indexPath.row];

    UILabel *messageLabel = [[UILabel alloc] init];

    [cell addSubview:messageLabel];

    messageLabel.text = messsgeArr[indexPath.row];

    messageLabel.numberOfLines = ;

    messageLabel.backgroundColor = [UIColor clearColor];

    messageLabel.textColor = [UIColor blackColor];

    UIFont *font = [UIFont fontWithName:@"Arial" size:];

    messageLabel.font = font;

    CGSize constraint = CGSizeMake(cellWidth - , );

    CGSize size = [messageLabel.text sizeWithFont:font constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];

//    CGSize labelSize = [messageLabel.text boundingRectWithSize:boundSize options:NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16]} context:nil].size;

    messageLabel.frame = CGRectMake(, , size.width,size.height);

    CGRect rect = cell.frame;

    rect.size.height = timeLabel.frame.size.height + messageLabel.frame.size.height + ;

    cell.frame = rect;

    return cell;

}

@end