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

#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;
}

#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

#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

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

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

#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