本文探讨了iOS开发中自动换行技术的应用，详细解释了如何处理字符串换行及行数设置，提供了实例代码帮助开发者解决布局和内容显示问题。
[NSString*对象 sizeWithFont:constrainedToSize:]
这个方法用于获取 以传入模式下的 字符串像素大小。
这玩意今天坑了我很久。表示 各种陷阱。
如果你是从android转过来的 请看看下面。
首先 如果使用ios6的autolayout你会在最后发现你被坑了。
然后ios 的tablecell不会随着你的内容变化的缩小放大。
lableView也不会。
更蛋疼的是lableView不会换行--》也就是说你需要自己处理换行。今天用了个递归去+“/n”
自己换行就算了- -，还需要自己设置行数。否则显示不出来的亲。
【改：如果你把行数默认成0的话 他会自适应行数 也就是说 你内容有多少行他就多少行 但是frame还是要自己设置】
计算行数
【计算移动距离不需要通过行数。】
str为输入内容 move 为算出 当前frame相对于单行是移动了多少。[用于给其他受影响的view修改orgain.x]
CGSize size=[str sizeWithFont:[UIFont systemFontOfSize:17.0] constrainedToSize:CGSizeMake(210.0f,1000.0f ) lineBreakMode:NSLineBreakByWordWrapping];
//将str字符串以sizeWithFont 的字体模式 单词切割模式 传入指定的大小的size[宽度超过210就换行]内 所需要的实际高度和宽度。
//【传入的size 为限制值，高度和宽度最大只能为传入宽度大小】
CGSize size2=[@"1" sizeWithFont:[UIFont systemFontOfSize:17.0] constrainedToSize:CGSizeMake(210.0f,1000.0f ) lineBreakMode:NSLineBreakByWordWrapping];
int move=size.height-size2.height
总结一下：
1.你需要知道你的内容的行数。
2.你需要对你内容 进行换行处理并且设置行数。
【在stroyboard里面设置lable行数为0，既可自动换行】
3.你需要根据你内容的行数修改你的布局。包括自己的frame.size.height，被影响的frame.origen.y[计算出 位移(当前size-@""的size)，然后给+被影响的]。
4.你还要修改cell的高度。
5.确定不要使用autoLayout。
下面是demo 这个demo里面很多老东西 可以别看- -
//
// tableViewVC.m
// swearWorldDemo
//
// Created by liu poolo on 12-10-17.
// Copyright (c) 2012年 liu poolo. All rights reserved.
//
#import "tableViewVC.h"
#import "MyXMLParser.h"
#import "SwearVO.h"
#import "CountryVO.h"
#import <Social/Social.h>
#import <QuartzCore/QuartzCore.h>
#import "ButtonCell.h"
@interface tableViewVC ()
@property NSMutableArray *array;
@property NSString *pathSwear;
@property (nonatomic) NSString *pathCountry;
@property NSInteger currentSection;
@property NSString *text;
@property UIImage *image;
@property NSArray *fireImages;
@end
@implementation tableViewVC
@synthesize array=_array;
@synthesize pathCountry=_pathCountry;
@synthesize pathSwear=_pathSwear;
@synthesize swearDy=_swearDy;
@synthesize countryDy=_countryDy;
@synthesize text=_text;
@synthesize image=_image;
@synthesize fireImages;
- (void)setSwearDy:(NSArray *)swearDy{
if(_swearDy!=swearDy){
_swearDy=swearDy;
[self.tableView reloadData];
NSLog(@"setSwearDy");
}
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// self.pathSwear=[[NSBundle mainBundle] pathForResource:@"swearList" ofType:@"plist"];
// self.swearDy=[NSArray arrayWithContentsOfFile:self.pathSwear];
// self.pathCountry=[[NSBundle mainBundle] pathForResource:@"countryList" ofType:@"plist"];
// self.countryDy=[NSArray arrayWithContentsOfFile:self.pathCountry];
self.currentSection=-1;
NSLog(@"viewDidLoad");
//设置table的一些参数
self.tableView.backgroundView=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"background.jpg"]];
self.tableView.sectionIndexColor=[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1];
self.tableView.sectionIndexTrackingBackgroundColor=[UIColor colorWithRed:0.50196081399917603 green:0.25098040699958801 blue:0.0 alpha:0.6];
//加载fireImage;
self.fireImages=@[[UIImage imageNamed:@"fire1.png"],[UIImage imageNamed:@"fire2.png"],[UIImage imageNamed:@"fire3.png"],[UIImage imageNamed:@"fire4.png"],[UIImage imageNamed:@"fire5.png"],[UIImage imageNamed:@"fire6.png"]];
}
-(void)viewWillAppear:(BOOL)animated{
NSLog(@"viewWillAppear");
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [self.countryDy count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSInteger countryID=[self getCountryIdBySession:section];
return [[self getArrayByCountryId:countryID] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"swearInfo";
ButtonCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if(cell==nil){
cell=[[ButtonCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
if(self.currentSection!=indexPath.section){
//进入新的section了
NSInteger countryID=[self getCountryIdBySession:indexPath.section];
self.array=[[self getArrayByCountryId:countryID] mutableCopy];
}
cell= [self CellSetedByRow:indexPath.row withArray:self.array andCell:cell];
// 修改 右边 导航栏背景色 残疾法
// for(UIView *view in [tableView subviews])
// {
//
// if([[[view class] description] isEqualToString:@"UITableViewIndex"])
// {
//
////
//// if(indexPath.row%2){
//// [view setBackgroundColor:[UIColor yellowColor]];
//// }else{
//// [view setBackgroundColor:[UIColor blueColor]];
//// }
////
////// [view setFont:[UIFont systemFontOfSize:14]];
// }
// }
return cell ;
}
- (NSArray *)getArrayByCountryId:(NSInteger) countryid{
//根据国家ID获取对应粗口数组
NSMutableArray * tempArray=[[NSMutableArray alloc]init];
for(CountryVO *a in self.swearDy){
if([a.countryId integerValue]==countryid){
[tempArray addObject:a];
}
}
return tempArray;
}
- (NSInteger)getCountryIdBySession:(NSInteger) section{
//通过session获得国家id
NSInteger result=0;
CountryVO * tempD=(CountryVO *)[self.countryDy objectAtIndex:section];
result =[tempD.countryId integerValue];
return result;
}
- (NSString *)CountryNameBySession:(NSInteger) section{
//通过session获得国家名
NSString *result=0;
CountryVO *tempD=(CountryVO *)[self.countryDy objectAtIndex:section];
result = tempD.countryName;
return result;
}
//
//-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
//
//
//}
#define BASEHEIGHT 76 //cell初始状态高度
#define PERHEIGHT 20 //每次行增加距离
#define DEFAULT 27 //初始name 高度
#define rowSize 22 //每行字节数
#define DEFAULTDSCRIBE 24 //出状态DSCRIBE 高度
- (ButtonCell *)CellSetedByRow:(NSInteger)row withArray:(NSArray *)a andCell:(ButtonCell *)cell{
//根据行号，对应的数组，和CELL设置CELL。
SwearVO * swearVO= (SwearVO *)[a objectAtIndex:row];
// UILabel * labCountry=(UILabel *)[cell viewWithTag:-1];
// UILabel * labName=(UILabel *)[cell viewWithTag:-2];
// UILabel * labLevel=(UILabel *)[cell viewWithTag:-3];
//// UILabel * labImagePath=(UILabel *)[cell viewWithTag:-4];
// UILabel * labdescribe=(UILabel *)[cell viewWithTag:-5];
// UIButton *bt=(UIButton *)[cell viewWithTag:-6];
// ((UILabel *)[cell viewWithTag:10]).text=@"这里是Cellview";
// 简单说明下想对cell直接丢text[虽然我估计你不会这么操作，而且这么操作会让子VIEW不显示]
// 是无法使用cell.text的
// 而是使用cell viewWithTag:x
// 这里很有趣cell能通过自己的viewWithTag 来获取自己顶层的view[此view无法循环viweWithTag]。然后进行操作。
// UITableViewCell * b=((UITableViewCell *)[cell viewWithTag:10]);
// ((UILabel *)[b viewWithTag:1]).text=@"so funy";
//赋值
cell.idlb.text=swearVO.swearId;
cell.describe.text=swearVO.swearIntroduce;
cell.button.tag=[swearVO.swearId integerValue];
if([self.fireImages objectAtIndex:[swearVO.fireLever integerValue]-1]){
cell.fire.image=[self.fireImages objectAtIndex:[swearVO.fireLever integerValue]-1];
}
//计算cell变化 start
int line;
if(swearVO.swearName.length%rowSize){
line =(swearVO.swearName.length/rowSize)+1;
}else{
line=(swearVO.swearName.length/rowSize);
}
NSString *str=swearVO.swearName ;
CGSize size=[str sizeWithFont:[UIFont systemFontOfSize:17.0] constrainedToSize:CGSizeMake(210.0f,1000.0f ) lineBreakMode:NSLineBreakByWordWrapping];
CGSize size2=[@"1" sizeWithFont:[UIFont systemFontOfSize:17.0] constrainedToSize:CGSizeMake(210.0f,1000.0f ) lineBreakMode:NSLineBreakByWordWrapping];
//name frame修改
CGRect rect=cell.name.frame;
rect.size.height=size.height;
int move=size.height-size2.height;
cell.name.frame=rect;
//name内容增加"\n"换行符 那个方法用了递归
cell.name.text=str;
//修改Dscribe位置
CGRect rectDscribe;
rectDscribe=cell.describe.frame;
// NSLog(@"%f!!!!!!!!",rectDscribe.origin.y);
rectDscribe.origin.y=DEFAULTDSCRIBE+move;
cell.describe.frame=rectDscribe;
// cell.name.bounds=rectBound;
// NSLog(@"%d|%f|%f",[cell.name numberOfLines], cell.name.bounds.size.height, cell.name.frame.size.height);
// labCountry.text=swearVO.countryId;
// labName.text=swearVO.swearName;
// labLevel.text=swearVO.fireLever;
// labdescribe.text= cell.describe.text=swearVO.swearIntroduce;
// bt.tag=[swearVO.swearId integerValue];
// if(row%2){
// cell.contentView.backgroundColor=[UIColor yellowColor];
// }else{
// cell.contentView.backgroundColor=[UIColor yellowColor];
// }
return cell;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
return [self CountryNameBySession:section];
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
CGFloat height;
NSInteger countryID=[self getCountryIdBySession:indexPath.section];
NSArray *array=[[self getArrayByCountryId:countryID] mutableCopy];
SwearVO *swearVO=(SwearVO *)[array objectAtIndex:indexPath.row];
int line=(swearVO.swearName.length/(rowSize+1))+1;
height=BASEHEIGHT+(line-1)*PERHEIGHT;
return height;
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self srceenShot];
NSInteger countryID=[self getCountryIdBySession:indexPath.section];
self.array=[[self getArrayByCountryId:countryID] mutableCopy];
SwearVO *swearVO=(SwearVO *)[self.array objectAtIndex:indexPath.row];
[self shareWithText:swearVO.swearName];
}
- (void)shareWithText:(NSString *)text{
NSArray *activityItems;
self.text=text;
if(self.image){
activityItems=@[self.text,self.image];
}else{
activityItems=@[self.text];
}
UIActivityViewController *avc=[[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:nil];
[self presentViewController:avc animated:YES completion:nil];
}
- (void)srceenShot{
// UIGraphicsPushContext(UIGraphicsGetCurrentContext());
UIGraphicsPushContext(UIGraphicsGetCurrentContext());
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
self.image=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIGraphicsPopContext();
// UIGraphicsPopContext();
}
- (IBAction)btVideoPressed:(UIButton *)sender {
// UITableViewCell *cell=(UITableViewCell *)sender.superview;
NSLog(@"%d",sender.tag);
}
-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView{
//用于设置sectionIndexTitle
//返回要为一个内容为NSString 的NSArray 里面存放section title;
//默认情况下 section Title根据顺序对应 section 【如果不写tableView: sectionForSectionIndexTitle: atIndex:的话】
NSMutableArray* a=[NSMutableArray array];
for(CountryVO *c in self.countryDy){
[a addObject: [c.countryName substringToIndex:1]];
}
// self.tableView.sec
// self.tableView.sectionIndexTrackingBackgroundColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];
// return b=@[@"1",@"2"];
return a;
}
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index{
//传入 section title 和index 返回其应该对应的session序号。
//一般不需要写 默认section index 顺序与section对应。除非 你的section index数量或者序列与section不同才用修改
return index;
}
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
UIImageView *result=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"title_bg.png"]];
UILabel *content=[[UILabel alloc]initWithFrame:CGRectZero];
content.frame = CGRectMake(10.0, 0.0, 300.0, 18.0);
content.font=[UIFont systemFontOfSize:15];
content.backgroundColor=[UIColor clearColor];
content.textColor=[UIColor whiteColor];
content.text=((CountryVO *)[self.countryDy objectAtIndex:section]).countryName;
[result addSubview:content];
return result;
}
//根据传入的string增补 "\n"
//注：【在stroyboard里面设置lable行数为0，既可自动换行】
//-(NSString *)stringWillNByString:(NSString *)str line:(NSInteger)lineNum{
// NSString *firstStr;
// NSString *secondStr;
// if(str.length>rowSize){
// firstStr=[str substringToIndex:rowSize];
// firstStr=[firstStr stringByAppendingString:@"\n"];
// secondStr=[str substringFromIndex:rowSize];
// [self stringWillNByString:secondStr line:lineNum-1];
// return [NSString stringWithFormat:@"%@%@",firstStr,secondStr];
// }else{
// secondStr=str;
// return secondStr;
// }
//
//
//}
@end
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