IOS第八天(4:UITableViewController新浪微博, 代码创建布局和数据转模型)

******控制control

#import "HMViewController.h"
#import "HMStatus.h"
#import "HMStatusCell.h"

@interface HMViewController ()
@property (nonatomic, strong) NSArray *statuses;
@end

@implementation HMViewController

- (NSArray *)statuses
{
    if (_statuses == nil) _statuses = [HMStatus statuses];
    return _statuses;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.tableView.rowHeight = 200;
}

#pragma mark - 数据源方法
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.statuses.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"Cell";
    HMStatusCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    
    if (cell == nil) {
        cell = [[HMStatusCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
    }
    
    // 赋值
    cell.status = self.statuses[indexPath.row];
    
    return cell;
}

#pragma mark - 代理方法
/** 计算单元格行高 */
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    /**
     计算行高的方法，会在加载表格数据时，有多少行计算多少次 contentSize
     
     问题：此方法执行的时候，cell还没有被实例化！
     但是：行高计算是在实例化cell时，通过设置status属性，计算的=>有了status模型，就可以知道行高！
     
     问题：如何在cell实例化之前，获得行高？
     解决方法：通过status可以计算得到行高！=》再建立一个模型，专门计算所有控件的位置
     */
    return 200;
}

******modol

#import <Foundation/Foundation.h>

@interface HMStatus : NSObject

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *icon;
@property (nonatomic, copy) NSString *text;
@property (nonatomic, copy) NSString *picture;
@property (nonatomic, assign) BOOL vip;

- (instancetype)initWithDict:(NSDictionary *)dict;
+ (instancetype)statusWithDict:(NSDictionary *)dict;

+ (NSArray *)statuses;

@end

***** HMStatus.m文件

#import "HMStatus.h"

@implementation HMStatus

- (instancetype)initWithDict:(NSDictionary *)dict
{
    self = [super init];
    if (self) {
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}

+ (instancetype)statusWithDict:(NSDictionary *)dict
{
    return [[self alloc] initWithDict:dict];
}

+ (NSArray *)statuses
{
    NSArray *array = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"statuses.plist" ofType:nil]];
    
    NSMutableArray *arrayM = [NSMutableArray array];
    for (NSDictionary *dict in array) {
        [arrayM addObject:[self statusWithDict:dict]];
    }
    
    return arrayM;
}

@end

*****cell

#import <UIKit/UIKit.h>
@class HMStatus;

@interface HMStatusCell : UITableViewCell
@property (nonatomic, strong) HMStatus *status;
@end

cell m文件

#import "HMStatusCell.h"
#import "HMStatus.h"

/** 姓名字体 */
#define kNameFont   [UIFont systemFontOfSize:14]
/** 正文字体 */
#define kTextFont   [UIFont systemFontOfSize:16]

@interface HMStatusCell()

@property (nonatomic, strong) UIImageView *iconView;
@property (nonatomic, strong) UILabel *nameView;
@property (nonatomic, strong) UIImageView *vipView;
@property (nonatomic, strong) UILabel *textView;
@property (nonatomic, strong) UIImageView *pictureView;

@end

@implementation HMStatusCell

- (UIImageView *)iconView
{
    if (_iconView == nil) {
        _iconView = [[UIImageView alloc] init];
        [self.contentView addSubview:_iconView];
    }
    return _iconView;
}

- (UILabel *)nameView
{
    if (_nameView == nil) {
        _nameView = [[UILabel alloc] init];
        // 默认字体是17号
        _nameView.font = kNameFont;
        [self.contentView addSubview:_nameView];
    }
    return _nameView;
}

- (UIImageView *)vipView
{
    if (_vipView == nil) {
        _vipView = [[UIImageView alloc] init];
        _vipView.image = [UIImage imageNamed:@"vip"];
        _vipView.hidden = YES;
        
        [self.contentView addSubview:_vipView];
    }
    return _vipView;
}

- (UILabel *)textView
{
    if (_textView == nil) {
        _textView = [[UILabel alloc] init];
        _textView.font = kTextFont;
        _textView.numberOfLines = 0;
        
        [self.contentView addSubview:_textView];
    }
    return _textView;
}

- (UIImageView *)pictureView
{
    if (_pictureView == nil) {
        _pictureView = [[UIImageView alloc] init];
        [self.contentView addSubview:_pictureView];
    }
    return _pictureView;
}

- (void)setStatus:(HMStatus *)status
{
    _status = status;
    
    // 1> 设置数据
    [self settingData];
    
    // 2> 设置位置
    [self settingFrame];
}

/** 设置数据 */
- (void)settingData
{
    // 头像
    self.iconView.image = [UIImage imageNamed:self.status.icon];
    // 姓名
    self.nameView.text = self.status.name;
    // vip(可选的)
    if (self.status.vip) {
        self.vipView.hidden = NO;
        self.nameView.textColor = [UIColor redColor];
    } else {
        self.vipView.hidden = YES;
        self.nameView.textColor = [UIColor blackColor];
    }
    
    // 正文
    self.textView.text = self.status.text;
    
    // 配图(可选参数)
    // imageNamed:nil CUICatalog: Invalid asset name supplied: (null), or invalid scale factor: 2.000000
    if (self.status.picture.length > 0) {
        self.pictureView.hidden = NO;
        self.pictureView.image = [UIImage imageNamed:self.status.picture];
    } else {
        self.pictureView.hidden = YES;
    }
}

/** 设置位置 */
- (void)settingFrame
{
    // 0. 定义间距
    CGFloat padding = 10;
    
    // 1. 头像
    CGFloat iconX = padding;
    CGFloat iconY = padding;
    CGFloat iconW = 30;
    CGFloat iconH = 30;
    self.iconView.frame = CGRectMake(iconX, iconY, iconW, iconH);
    
    // 2. 姓名大小由文字的长度来决定
    // boundingRectWithSize计算给定文本字符串所占的区域
    // 返回值是一个x,y = 0的CGRect,w,h是计算好的宽高
    //
    // 如果要计算多行的准确高度，需要传入NSStringDrawingUsesLineFragmentOrigin选项
    // dict用于指定字体的相关属性的字典，UIKit框架中的第一个头文件
    // context: nil
    NSDictionary *nameDict = @{NSFontAttributeName: kNameFont};
    CGRect nameFrame = [self.status.name boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:nameDict context:nil];
    nameFrame.origin.x = CGRectGetMaxX(self.iconView.frame) + padding;
    nameFrame.origin.y = padding + (self.iconView.bounds.size.height - nameFrame.size.height) * 0.5;
    self.nameView.frame = nameFrame;
    
    // vip图标
    CGFloat vipX = CGRectGetMaxX(self.nameView.frame) + padding;
    CGFloat vipY = self.nameView.frame.origin.y;
    CGFloat vipW = 14;
    CGFloat vipH = 14;
    self.vipView.frame = CGRectMake(vipX, vipY, vipW, vipH);
    
    // 正文
    NSDictionary *textDict = @{NSFontAttributeName: kTextFont};
    CGRect textFrame = [self.status.text boundingRectWithSize:CGSizeMake(300, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:textDict context:nil];
    textFrame.origin.x = padding;
    textFrame.origin.y = CGRectGetMaxY(self.iconView.frame) + padding;
    self.textView.frame = textFrame;
    
    CGFloat cellHeight;
    
    if (self.status.picture.length > 0) {
        // 配图
        CGFloat pictureX = padding;
        CGFloat pictureY = CGRectGetMaxY(textFrame) + padding;
        CGFloat pictureW = 100;
        CGFloat pictureH = 100;
        self.pictureView.frame = CGRectMake(pictureX, pictureY, pictureW, pictureH);
        
        cellHeight = CGRectGetMaxY(self.pictureView.frame) + padding;
    } else {
        cellHeight = CGRectGetMaxY(self.textView.frame) + padding;
    }
}

@end