UI第十三天

注意：

1.UITableViewCell自定义有多少种格式就自定义多少个customTableViewCell

2.自定义cell定义东西都加到self.contentView上

[self.contentView
addSubview:_imageV3];

3.MVC:

MVC设计模式
M:model
数据模型
V:view
视图
C:controller
控制器

4.MVC步骤：

(1).创建一个继承于NSObject的子类：CellModel

(2)CellModel中声明的NSString或NSArray的命名最好与plist文件中的名字相同:

@property (copy,nonatomic)
NSString *name;

如果不同：

@property (copy,nonatomic)
NSString *introStr;

到cellModel文件的实现中：
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{

//plist文件中的key名为name,cellModel中声明的属性名为nameStr，下面这样做也能识别nameStr,当plist文件中的key名与关键字重名是可以这样做

if ([key
isEqualToString:@"name"])
{

self.nameStr = value;
}
}

(3).自定义cell头文件中:
a.@class CellModel;//前置声明
与import区别
避免重复

//model当做cell的属性:

@property (strong,nonatomic)
CellModel *model;

(4)自定义cell实现文件中:

a.#import "CellModel.h"

b.- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString
*)reuseIdentifier

这个里面只创建头文件中声明的东西：
_nameLabel = [[UILabel
alloc] init];

_nameLabel.font = [UIFont
boldSystemFontOfSize:18];
[self.contentView
addSubview:_nameLabel];

c.重写model的setter方法：
- (void)setModel:(CellModel *)model
{

_model = model;

//赋值

_imageV1.image = [UIImage
imageNamed:[_model.icon
stringByAppendingString:@".jpg"]];

_titleLabel.text = model.nameStr;

_timeLabel.text = model.time;

_detailLabel.text = model.text;

//计算位置大小

_imageV1.frame =
CGRectMake(10,
20, 50,
50);

_titleLabel.frame =
CGRectMake(CGRectGetMaxX(_imageV1.frame)+5,
_imageV1.frame.origin.y,
SCREENWH -
CGRectGetMaxX(_imageV1.frame),
30);

_timeLabel.frame =
CGRectMake(_titleLabel.frame.origin.x,
CGRectGetMaxY(_titleLabel.frame),
_titleLabel.frame.size.width,
_imageV1.frame.size.height-_titleLabel.frame.size.height);

//根据字的多少来计算frame.size.height

CGRect frame = [model.text
boundingRectWithSize:CGSizeMake(SCREENWH -
20,
MAXFLOAT) options:NSStringDrawingUsesFontLeading |
NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont
systemFontOfSize:13]}
context:nil];

_detailLabel.frame =
CGRectMake(_imageV1.frame.origin.x,
CGRectGetMaxY(_imageV1.frame),
SCREENWH - 20, frame.size.height);

for (UIView *view
in self.contentView.subviews)
{

if ([view isKindOfClass:[UIImageView
class]])
{

if (view.tag !=
100)
{
[view
removeFromSuperview];
}
}
}

NSInteger count = model.images.count;

CGFloat imageW = (SCREENWH -
20)/3;

for (int i =
0; i < count; ++i)
{

NSInteger x = i %
3;

NSInteger y = i /
3;

UIImageView *imageVi = [[UIImageView
alloc] initWithFrame:CGRectMake(10+imageW*x,
CGRectGetMaxY(_detailLabel.frame)+y*imageW, imageW, imageW)];
imageVi.image = [UIImage
imageNamed:[model.images[i]
stringByAppendingString:@".jpg"]];
[self.contentView
addSubview:imageVi];
}
}

(5).controller中

a.

#import "CustomTableViewCell.h"

#import "CellModel.h"

b.

/*

什么是KVC? key-value-coding
键值对编码

*/

//dataArray懒加载
- (NSMutableArray *)dataArray
{

if (_dataArray ==
nil)
{

NSString *path = [[NSBundle
mainBundle] pathForResource:@"QQ.plist"
ofType:@""];

NSArray *array = [NSArray
arrayWithContentsOfFile:path];

_dataArray = [NSMutableArray
array];

for (NSDictionary *dic
in array)
{

CellModel *model = [[CellModel
alloc] init];

[model setValuesForKeysWithDictionary:dic];

//上面这样用必须保证cellModel中的属性名与plist文件一样
[_dataArray
addObject:model];
}
}

return
_dataArray;
}

c.
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath
*)indexPath
{

CellModel *model =
self.dataArray[indexPath.row];

//计算文字的高度

CGRect frame = [model.text
boundingRectWithSize:CGSizeMake(SCREENWH -
20,
MAXFLOAT) options:NSStringDrawingUsesFontLeading |
NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont
systemFontOfSize:13]}
context:nil];

//图片的高度

NSInteger count = model.images.count;

CGFloat imageH;

if (count != 0)
{

if (count >= 0 && count <
4)
{
imageH = (SCREENWH-20)/3;
}

else if (count >=
4 && count < 7)
{
imageH =
2*(SCREENWH-20)/3;
}

else
{
imageH =
3*(SCREENWH-20)/3;
}
}

else
{
imageH =
0;
}

return frame.size.height +
70 + imageH;
}

d.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath
{
static NSString *cellID = @"cellID";
CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if (!cell)
{
cell = [[CustomTableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
}
cell.model =
self.dataArray[indexPath.row];

return cell;
}

5.scrollView中隐藏水平的滑动条

_scrollV1.showsHorizontalScrollIndicator =
NO;

一些概念：

1.#pragma mark ---数据源懒加载 *****
- (NSMutableArray *)dataArray
{

if (_dataArray ==
nil)
{

NSString *path = [[NSBundle
mainBundle]pathForResource:@"CellModel"
ofType:@"plist"];

_dataArray = [NSMutableArray
arrayWithContentsOfFile:path];
}

return
_dataArray;
}

2.#pragma mark ---table的懒加载
- (UITableView *)table
{

if (_table ==
nil)
{

_table = [[UITableView
alloc] initWithFrame:CGRectMake(0,
20,
self.view.frame.size.width,
self.view.frame.size.height
- 20)
style:UITableViewStylePlain];

_table.delegate =
self;

_table.dataSource =
self;

_table.tableFooterView = [[UIView
alloc]
initWithFrame:CGRectZero];
}

return _table;
}

3.自定义cell中 重写的是- (instancetype) initWithStyle:(UITableViewCellStyle)style
reuseIdentifier:(NSString *)reuseIdentifier