环信代码分析笔记2

1.续前一。getter的妙用。结构清晰。

[self.view addSubview:self.searchBar];

[self.view addSubview:self.tableView];

[self.tableView addSubview:self.slimeView];

2.检测网络状态变化 ，然后是否显示网络没连接状态。

(UIView *)networkStateView//getter.

{

if (_networkStateView == nil) {

_networkStateView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.tableView.frame.size.width, 44)];

_networkStateView.backgroundColor = [UIColor colorWithRed:255 / 255.0 green:199 / 255.0 blue:199 / 255.0 alpha:0.5];

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, (_networkStateView.frame.size.height - 20) / 2, 20, 20)];
imageView.image = [UIImage imageNamed:@"messageSendFail"];
[_networkStateView addSubview:imageView];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(imageView.frame) + 5, 0, _networkStateView.frame.size.width - (CGRectGetMaxX(imageView.frame) + 15), _networkStateView.frame.size.height)];
label.font = [UIFont systemFontOfSize:15.0];
label.textColor = [UIColor grayColor];
label.backgroundColor = [UIColor clearColor];
label.text = NSLocalizedString(@"network.disconnection", @"Network disconnection");
[_networkStateView addSubview:label];

}

return _networkStateView;

}

(void)networkChanged:(EMConnectionState)connectionState

{

if (connectionState == eEMConnectionDisconnected) {

_tableView.tableHeaderView = _networkStateView;

}

else{

_tableView.tableHeaderView = nil;

}

}

3.ＣＥＬＬ里自定义ＩＭＡＧＥ和ＬＡＢＥＬ的位置。

-(void)layoutSubviews{

[super layoutSubviews];

CGRect frame = self.imageView.frame;

// [self.imageView sd_setImageWithURL:_imageURL placeholderImage:_placeholderImage];

[self.imageView imageWithUsername:_name placeholderImage:_placeholderImage];

self.imageView.frame = CGRectMake(10, 7, 45, 45);

// self.textLabel.text = _name;

[self.textLabel setTextWithUsername:_name];

self.textLabel.frame = CGRectMake(65, 7, 175, 20);

｝

4.消息模型设计：文字语音，图片。发送接收者

import

define KFIRETIME 20

@interface MessageModel : NSObject

{

BOOL _isPlaying;

}

@property (nonatomic) MessageBodyType type;

@property (nonatomic, readonly) MessageDeliveryState status;

@property (nonatomic) BOOL isSender; //是否是发送者

@property (nonatomic) BOOL isRead; //是否已读

@property (nonatomic) EMMessageType messageType; // 消息类型（单聊，群里，聊天室）

@property (nonatomic, strong, readonly) NSString *messageId;

@property (nonatomic, strong) NSURL *headImageURL;

@property (nonatomic, strong) NSString *nickName;

@property (nonatomic, strong) NSString *username;

//text

@property (nonatomic, strong) NSString *content;

//image

@property (nonatomic) CGSize size;

@property (nonatomic) CGSize thumbnailSize;

@property (nonatomic, strong) NSURL *imageRemoteURL;

@property (nonatomic, strong) NSURL *thumbnailRemoteURL;

@property (nonatomic, strong) UIImage *image;

@property (nonatomic, strong) UIImage *thumbnailImage;

//audio

@property (nonatomic, strong) NSString *localPath;

@property (nonatomic, strong) NSString *remotePath;

@property (nonatomic) NSInteger time;

@property (nonatomic, strong) EMChatVoice *chatVoice;

@property (nonatomic) BOOL isPlaying;

@property (nonatomic) BOOL isPlayed;

//location

@property (nonatomic, strong) NSString *address;

@property (nonatomic) double latitude;

@property (nonatomic) double longitude;

@property (nonatomic, strong)id messageBody;

@property (nonatomic, strong)EMMessage *message;

@end

5根据是否是发送者来定头像的位置。

.-(void)layoutSubviews

{

[super layoutSubviews];

CGRect frame = _headImageView.frame;
frame.origin.x = _messageModel.isSender ? (self.bounds.size.width - _headImageView.frame.size.width - HEAD_PADDING) : HEAD_PADDING;
_headImageView.frame = frame;

[_nameLabel sizeToFit];
frame = _nameLabel.frame;
frame.origin.x = HEAD_PADDING * 2 + CGRectGetWidth(_headImageView.frame) + NAME_LABEL_PADDING;
frame.origin.y = CGRectGetMinY(_headImageView.frame);
frame.size.width = NAME_LABEL_WIDTH;
_nameLabel.frame = frame;

}