IOS高访微信聊天对话界面(sizeWithFont:constrainedToSize和stretchableImageWithLeftCapWidth的使用)
2013-11-08 18:19
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大家好,百忙之中,抽出点空,写个微博,话说好久没写。
最近项目中有碰到写类似微信聊天界面上的效果,特整理了一下,写了一个小的Demo,希望给没头绪的同学们一个参考!
Demo下载地址:http://download.csdn.net/detail/rhljiayou/6524347
先看一下效果图:左图为截取微信的,右图是本demo的效果
再看一下主要代码实现:
其实很简单,主要说一下两个知识点,重要的两个知识点就能写出完美的泡泡对话聊天!
第一个是NSString中的一个方法:
- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakMode;
根据文本内容,算出所需要的大小CGSize;
第二个是UIImage中的一个方法:
- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight;
这里有几遍文章供大家参考这个方法的使用:
http://blog.csdn.net/lixing333/article/details/7589281 http://blog.csdn.net/w122079514/article/details/7848980
http://www.cnblogs.com/bandy/archive/2012/04/25/2469369.html
2013-12-31 10:19编辑
感谢这位朋友的提出
写此Demo的时候,没有考虑到那么多,发现了一些问题,具体请参考后来写的此文章:
可以做个参考,另外更新一下此Demo的下载:
http://download.csdn.net/detail/rhljiayou/6791445
转载来自任海丽博客
最近项目中有碰到写类似微信聊天界面上的效果,特整理了一下,写了一个小的Demo,希望给没头绪的同学们一个参考!
Demo下载地址:http://download.csdn.net/detail/rhljiayou/6524347
先看一下效果图:左图为截取微信的,右图是本demo的效果
再看一下主要代码实现:
@implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"weixin",@"name",@"微信团队欢迎你。很高兴你开启了微信生活,期待能为你和朋友们带来愉快的沟通体检。",@"content", nil]; NSDictionary *dict1 = [NSDictionary dictionaryWithObjectsAndKeys:@"rhl",@"name",@"hello",@"content", nil]; NSDictionary *dict2 = [NSDictionary dictionaryWithObjectsAndKeys:@"rhl",@"name",@"0",@"content", nil]; NSDictionary *dict3 = [NSDictionary dictionaryWithObjectsAndKeys:@"weixin",@"name",@"谢谢反馈,已收录。",@"content", nil]; NSDictionary *dict4 = [NSDictionary dictionaryWithObjectsAndKeys:@"rhl",@"name",@"0",@"content", nil]; NSDictionary *dict5 = [NSDictionary dictionaryWithObjectsAndKeys:@"weixin",@"name",@"谢谢反馈,已收录。",@"content", nil]; NSDictionary *dict6 = [NSDictionary dictionaryWithObjectsAndKeys:@"rhl",@"name",@"大数据测试,长数据测试,大数据测试,长数据测试,大数据测试,长数据测试,大数据测试,长数据测试,大数据测试,长数据测试,大数据测试,长数据测试。",@"content", nil]; _resultArray = [NSMutableArray arrayWithObjects:dict,dict1,dict2,dict3,dict4,dict5,dict6, nil]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } //泡泡文本 - (UIView *)bubbleView:(NSString *)text from:(BOOL)fromSelf withPosition:(int)position{ //计算大小 UIFont *font = [UIFont systemFontOfSize:14]; CGSize size = [text sizeWithFont:font constrainedToSize:CGSizeMake(180.0f, 20000.0f) lineBreakMode:NSLineBreakByWordWrapping]; // build single chat bubble cell with given text UIView *returnView = [[UIView alloc] initWithFrame:CGRectZero]; returnView.backgroundColor = [UIColor clearColor]; //背影图片 UIImage *bubble = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:fromSelf?@"SenderAppNodeBkg_HL":@"ReceiverTextNodeBkg" ofType:@"png"]]; UIImageView *bubbleImageView = [[UIImageView alloc] initWithImage:[bubble stretchableImageWithLeftCapWidth:floorf(bubble.size.width/2) topCapHeight:floorf(bubble.size.height/2)]]; NSLog(@"%f,%f",size.width,size.height); //添加文本信息 UILabel *bubbleText = [[UILabel alloc] initWithFrame:CGRectMake(fromSelf?15.0f:22.0f, 20.0f, size.width+10, size.height+10)]; bubbleText.backgroundColor = [UIColor clearColor]; bubbleText.font = font; bubbleText.numberOfLines = 0; bubbleText.lineBreakMode = NSLineBreakByWordWrapping; bubbleText.text = text; bubbleImageView.frame = CGRectMake(0.0f, 14.0f, bubbleText.frame.size.width+30.0f, bubbleText.frame.size.height+20.0f); if(fromSelf) returnView.frame = CGRectMake(320-position-(bubbleText.frame.size.width+30.0f), 0.0f, bubbleText.frame.size.width+30.0f, bubbleText.frame.size.height+30.0f); else returnView.frame = CGRectMake(position, 0.0f, bubbleText.frame.size.width+30.0f, bubbleText.frame.size.height+30.0f); [returnView addSubview:bubbleImageView]; [returnView addSubview:bubbleText]; return returnView; } //泡泡语音 - (UIView *)yuyinView:(NSInteger)logntime from:(BOOL)fromSelf withIndexRow:(NSInteger)indexRow withPosition:(int)position{ //根据语音长度 int yuyinwidth = 66+fromSelf; UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.tag = indexRow; if(fromSelf) button.frame =CGRectMake(320-position-yuyinwidth, 10, yuyinwidth, 54); else button.frame =CGRectMake(position, 10, yuyinwidth, 54); //image偏移量 UIEdgeInsets imageInsert; imageInsert.top = -10; imageInsert.left = fromSelf?button.frame.size.width/3:-button.frame.size.width/3; button.imageEdgeInsets = imageInsert; [button setImage:[UIImage imageNamed:fromSelf?@"SenderVoiceNodePlaying":@"ReceiverVoiceNodePlaying"] forState:UIControlStateNormal]; UIImage *backgroundImage = [UIImage imageNamed:fromSelf?@"SenderVoiceNodeDownloading":@"ReceiverVoiceNodeDownloading"]; backgroundImage = [backgroundImage stretchableImageWithLeftCapWidth:20 topCapHeight:0]; [button setBackgroundImage:backgroundImage forState:UIControlStateNormal]; UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(fromSelf?-30:button.frame.size.width, 0, 30, button.frame.size.height)]; label.text = [NSString stringWithFormat:@"%d''",logntime]; label.textColor = [UIColor grayColor]; label.font = [UIFont systemFontOfSize:13]; label.textAlignment = NSTextAlignmentCenter; label.backgroundColor = [UIColor clearColor]; [button addSubview:label]; return button; } #pragma UITableView - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return _resultArray.count; } -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { NSDictionary *dict = [_resultArray objectAtIndex:indexPath.row]; UIFont *font = [UIFont systemFontOfSize:14]; CGSize size = [[dict objectForKey:@"content"] sizeWithFont:font constrainedToSize:CGSizeMake(180.0f, 20000.0f) lineBreakMode:NSLineBreakByWordWrapping]; return size.height+44; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; cell.selectionStyle = UITableViewCellSelectionStyleNone; }else{ for (UIView *cellView in cell.subviews){ [cellView removeFromSuperview]; } } NSDictionary *dict = [_resultArray objectAtIndex:indexPath.row]; //创建头像 UIImageView *photo ; if ([[dict objectForKey:@"name"]isEqualToString:@"rhl"]) { photo = [[UIImageView alloc]initWithFrame:CGRectMake(320-60, 10, 50, 50)]; [cell addSubview:photo]; photo.image = [UIImage imageNamed:@"photo1"]; if ([[dict objectForKey:@"content"] isEqualToString:@"0"]) { [cell addSubview:[self yuyinView:1 from:YES withIndexRow:indexPath.row withPosition:65]]; }else{ [cell addSubview:[self bubbleView:[dict objectForKey:@"content"] from:YES withPosition:65]]; } }else{ photo = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, 50, 50)]; [cell addSubview:photo]; photo.image = [UIImage imageNamed:@"photo"]; if ([[dict objectForKey:@"content"] isEqualToString:@"0"]) { [cell addSubview:[self yuyinView:1 from:NO withIndexRow:indexPath.row withPosition:65]]; }else{ [cell addSubview:[self bubbleView:[dict objectForKey:@"content"] from:NO withPosition:65]]; } } return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { } @end
其实很简单,主要说一下两个知识点,重要的两个知识点就能写出完美的泡泡对话聊天!
第一个是NSString中的一个方法:
- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakMode;
根据文本内容,算出所需要的大小CGSize;
第二个是UIImage中的一个方法:
- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight;
这里有几遍文章供大家参考这个方法的使用:
http://blog.csdn.net/lixing333/article/details/7589281 http://blog.csdn.net/w122079514/article/details/7848980
http://www.cnblogs.com/bandy/archive/2012/04/25/2469369.html
2013-12-31 10:19编辑
感谢这位朋友的提出
写此Demo的时候,没有考虑到那么多,发现了一些问题,具体请参考后来写的此文章:
IOS高访新浪微博界面(讲解如何自定义UITableViewCell,处理@#链接 特殊字符)
可以做个参考,另外更新一下此Demo的下载:http://download.csdn.net/detail/rhljiayou/6791445
转载来自任海丽博客
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