iOS项目开发基础(封装网络请求、json转model、方法顺序

前沿：整理了一个项目开发基础，涉及到开发初期的必备条件与开发中可以遵循的编码规范。源码请点击github地址下载。

目录

• 一.封装网络请求
• 二.json转model
• 三.方法顺序
• 四.文件结构
• 五.TableView自动布局
• 六.复用UITableViewHeaderFooterView
• 七.计算文本内容大小

一.封装网络请求

1.封装get请求

code1.png


2.封装post请求

code2.png


3.使用方法

[LXNetWorkTool get:urlStr param:param success:^(NSDictionary *responseDic) {

NSLog(@"%@", responseDic);

} failure:^(NSError *error) {

}];

二.json转model

获取到网络json数据后，无论多么复杂的数据结构，嵌套多少层，使用mj的一个第三方一句代码将字典转化成model，如下：

LXStockResult *resultModel = [LXStockResult objectWithKeyValues:responseDic];

但是必须先根据responseDic的数据结构定义好在LXStockResult的属性列表，如这样的数据结构：

screen1.png

需创建的model文件如下：

screen2.png

对应的属性列表如下：

@interface LXStockResult : NSObject
@property (nonatomic, strong) LXStockResponse *response;
@end

@interface LXStockResponse : NSObject
@property (nonatomic, strong) LXStockResponseStatus *responseStatus;
@property (nonatomic, strong) NSArray *stockList;
@end
@implementation LXStockResponse
+ (NSDictionary *)objectClassInArray
{
    return @{@"stockList":[LXStockList class]};
}
@end

@interface LXStockResponseStatus : NSObject
@property (nonatomic, copy)   NSString *status;
@property (nonatomic, copy)   NSString *statusInfo;
@end

@interface LXStockList : NSObject
@property (nonatomic, copy)   NSString *stockCode;
@property (nonatomic, copy)   NSString *stockName;
@end

三.方法顺序

#pragma mark - Life cycle
#pragma mark - Init data
#pragma mark - Loading data
#pragma mark - Create view
#pragma mark - UITableViewDelegate
#pragma mark - SystemDelegate
#pragma mark - CustomDelegate
#pragma mark - Observer
#pragma mark - Enent response
#pragma mark - Private methods
#pragma mark - Setter and getter

将方法顺序整理，利于快速查找方法，易于后期维护

展示效果如图：

screen4.png

四.文件结构

如下图：

screen3.png

有一个清晰的文件结构，利于理解业务与后期维护。

五.TableView自动布局

[LXNetWorkTool get:urlStr param:param success:^(NSDictionary *responseDic) {
    LXStockResult *resultModel = [LXStockResult objectWithKeyValues:responseDic];
    //这里将stockList模型数组再封装，通过model的数据与cell控件结合算出文本高。
    [self.showDataArr setArray:[self manageViewsFrameWithDatas:resultModel.response.stockList]];
    [self.tableView reloadData];
} failure:^(NSError *error) {
}];
- (NSArray *)manageViewsFrameWithDatas:(NSArray *)datas
{
    NSMutableArray *tempArr = [NSMutableArray array];
    for (LXStockList *listModel in datas) {
        LXTestStockFrame *frame = [[LXTestStockFrame alloc] init];
        frame.model = listModel;
        [tempArr addObject:frame];
    }
    return tempArr;
}
- (void)setModel:(LXStockList *)model
{
    _model = model;
    
    CGFloat stockNameLabelW = kScreenWidth - 2*globalAlignMargin;
    CGFloat stockNameLabelH = [LXHelpClass calculateLabelighWithText:model.stockName withMaxSize:CGSizeMake(stockNameLabelW, MAXFLOAT) withFont:18];
    self.stockNameLabelFrame = CGRectMake(globalAlignMargin, 12, stockNameLabelW, stockNameLabelH);
    
    CGFloat stockCodeLabelY = self.stockNameLabelFrame.origin.y + self.stockNameLabelFrame.size.height + 5;
    self.stockCodeLabelFrame = CGRectMake(self.stockNameLabelFrame.origin.x, stockCodeLabelY, 100, 12);
    
    self.cellHeight = self.stockCodeLabelFrame.origin.y + self.stockCodeLabelFrame.size.height + 12;
}

@interface LXTestStockFrame : NSObject
//数据源
@property (nonatomic, strong) LXStockList *model;
//cell高
@property (nonatomic, assign) CGFloat cellHeight;
//stockNameLabel的坐标
@property (nonatomic, assign) CGRect stockNameLabelFrame;
//stockCodeLabel的坐标
@property (nonatomic, assign) CGRect stockCodeLabelFrame;
@end

- (void)configurationCell:(LXTestStockFrame *)frameModel;
{
    self.stockNameLabel.frame = frameModel.stockNameLabelFrame;
    self.stockNameLabel.text = frameModel.model.stockName;
    
    self.stockCodeLabel.frame = frameModel.stockCodeLabelFrame;
    self.stockCodeLabel.text = frameModel.model.stockCode;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    LXTestStockFrame *frame = self.showDataArr[indexPath.row];
    return frame.cellHeight;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //如果有多种样式的cell，则可以根据区别indexPath.section或indexPath.row去创建不同的cell
    if (indexPath.section == 0) {
        LXTestTableCell *cell = [LXTestTableCell cellWithTableView:tableView];
        cell.row = indexPath.row;
        [cell configurationCell:self.showDataArr[indexPath.row]];
        return cell;
    } else {
        LXTestTableCell *cell = [LXTestTableCell cellWithTableView:tableView];
        cell.row = indexPath.row;
        [cell configurationCell:self.showDataArr[indexPath.row]];
        return cell;
    }
}

六.复用UITableViewHeaderFooterView

若UITableViewHeaderFooterView不采用复用机制，那么每次滑动TableView看见HeaderFooterView时都会掉用下面的代理方法从而不断重复创建

- (nullable UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    LXTestHeaderView *headerView = [LXTestHeaderView headerViewWithTableView:tableView];
    return headerView;
}

@implementation LXTestHeaderView
+ (instancetype)headerViewWithTableView:(UITableView *)tableView
{
    static NSString *headerId = @"headerView";
    LXTestHeaderView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:headerId];
    
    if (headerView == nil) {
        headerView = [[LXTestHeaderView alloc] initWithReuseIdentifier:headerId];
    }
    
    return headerView;
}
- (instancetype)initWithReuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithReuseIdentifier:reuseIdentifier]) {
        self.backgroundColor = globalGrayColor;
        
        UILabel *title = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, 44)];
        title.text = @"headerView也需要用复用池";
        title.textColor = globalRedWordColor;
        title.textAlignment = NSTextAlignmentCenter;
        title.font = [UIFont systemFontOfSize:18];
        [self addSubview:title];
    }
    return self;
}

七.计算文本内容大小

1.计算普通文本的高

+ (CGFloat)calculateLabelighWithText:(NSString *)textStr withMaxSize:(CGSize)maxSize withFont:(CGFloat)font
{
    NSDictionary * tdic = [NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:font], NSFontAttributeName, nil];
    CGSize actualSize = [textStr boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:tdic context:nil].size;
    return actualSize.height;
}

2.计算富文本的高

#define GetLabelNormalHeight(height,font,spaceH) (height + (height - [UIFont systemFontOfSize:font].pointSize)*(spaceH>0 ? spaceH : 0.05))
/**
 *@param textStr 富文本的string属性的值
 *@param maxSize 控件所需最大空间，一般高是最大值，如：CGSizeMake(stockNameLabelW, MAXFLOAT)
 *@param font 字体大小
 *@param spaceRH label行距占行高的比例，若没有设置行高，默认值为0.05
 */
+ (CGFloat)calculateLabelighWithText:(NSString *)textStr withMaxSize:(CGSize)maxSize withFont:(CGFloat)font withSpaceRH:(CGFloat)spaceRH
{
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
    NSDictionary *dic = @{NSFontAttributeName: [UIFont systemFontOfSize:font], NSParagraphStyleAttributeName:paragraphStyle.copy};
    CGRect rect = [textStr boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil];
    return GetLabelNormalHeight(rect.size.height, font, spaceRH);
}

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