自定义cell的高度

//
//  RootTableViewController.m
//  Share
//
//  Created by lanouhn on 15/1/20.
//  Copyright (c) 2015年 niutiantian. All rights reserved.
//

#import "RootTableViewController.h"
#import "CustomTableViewCell.h"
#import "DetailViewController.h"

static NSString *cellIndentifer = @"cell";

@interface RootTableViewController ()

@end

@implementation RootTableViewController

- (void)dealloc
{
    self.charString = nil;
    self.secondString = nil;
    self.custom = nil;
    [super dealloc];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.charString = @"只要有吃的，鱼就不停地吃？因为不知饥饱，鱼缸里的鱼因为喂食太多，给撑死了？只要有吃的，鱼就不停地吃？因为不知饥饱，鱼缸里的鱼因为喂食太多，给撑死了？只要有吃的，鱼就不停地吃？因为不知饥饱，鱼缸里的鱼因为喂食太多，给撑死了？";
    self.secondString = @"只要有吃的，鱼就不停地吃？因为不知饥饱，鱼缸里的鱼因为喂食太多，给撑死了？只要有吃的，鱼就不停地吃？因为不知饥饱，鱼缸";
    
        //注册cell
    [self.tableView registerClass:[CustomTableViewCell class] forCellReuseIdentifier:cellIndentifer];
    self.custom = [self.tableView dequeueReusableCellWithIdentifier:cellIndentifer];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

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

    return 1;
}

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

    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIndentifer forIndexPath:indexPath];
    if (indexPath.row % 2 == 0) {
        cell.label.text = _charString;         [cell resetLabelFram:_charString];              } else {         cell.label.text = _secondString;         [cell resetLabelFram:_secondString];     }         //错误案例 //    if (indexPath.row % 2 == 0) { //        self.tableView.rowHeight = [CustomTableViewCell heigehtCharString:_charString]; //    } else { //        self.tableView.rowHeight = [CustomTableViewCell heigehtCharString:_secondString]; //    }     return cell; } - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {         //方法一 //    if (indexPath.row % 2 == 0) { //       return [CustomTableViewCell heigehtCharString:_charString]; //    } else { //        return [CustomTableViewCell heigehtCharString:_secondString]; //    }         //方法二     if (indexPath.row % 2 == 0) {         self.custom.label.text = _charString;             } else {         self.custom.label.text = _secondString;          }     CGRect rect = [self.custom.label.text boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width, 0) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:17]} context:nil];     return rect.size.height; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {     DetailViewController *detail = [[DetailViewController alloc] init];     [self.navigationController pushViewController:detail animated:YES];     [detail release]; } @end // //  CustomTableViewCell.m //  Share // //  Created by lanouhn on 15/1/20. //  Copyright (c) 2015年 niutiantian. All rights reserved. // #import "CustomTableViewCell.h" @implementation CustomTableViewCell -(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {     if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {         self.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)];         _label.numberOfLines = 0;         [self addSubview:_label];         [_label release];     }     return self; } + (CGFloat)heigehtCharString: (NSString *)aString {     CGRect rect = [aString boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width, 0) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:17]} context:nil];     return  rect.size.height;      }     //重设label的高度 - (void)resetLabelFram: (NSString *)aString {        CGRect rect = [aString boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width, 0) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:17]} context:nil];          _label.frame = CGRectMake(0, 0, self.bounds.size.width, rect.size.height); } @end