UITableView的组的自定义与cell的重用

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《一》 UITableVIewCell的一个属性

@property (nonatomic,readonly, copy) NSString *reuseIdentifier;

所以在设置UITableVIewCell时候都要设置每种cell的Identifier标志来取cell，且每次创建的cell 都放放到dequue的数组里来管理cell的重用，

1.判断首先进来的是哪个组，用参数 indexPath.section获取到所取得得数组

2.首先在dequue的数组里用标志来取cell，实现重用 cell = [tableView dequeueReusableCellWithIdentifier:@"cell1"];

3.如果cell 为空，则cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell1"];来创建；

4.然后index.Path.row来自定义cell的大小，以及在cell上加子视图，（子视图要加到cell.content.view上）

5.- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section 来设置section的title

- (void)viewDidLoad

{

[superviewDidLoad];

// Do any additional setup after loading the view.

_homeTableView = [[UITableViewalloc]initWithFrame:CGRectMake(0,20, self.view.frame.size.width /3, self.view.frame.size.height)];

_homeTableView.delegate =self;

_homeTableView.dataSource =self;

[_homeTableView setBackgroundColor:[UIColororangeColor]];

_homeTableView.separatorColor = [UIColorpurpleColor];

// _homeTableView.

[self.viewaddSubview:_homeTableView];

}

//tabelView DataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

NSInteger num = 0;

if (section == 0) {

num = 1;

}

else if (section ==1) {

num = 4;

}

else if (section ==2) {

num = 2;

}

return num;

}

// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:

// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

UITableViewCell *cell = nil;

if (indexPath.section ==0) {

cell = [tableView dequeueReusableCellWithIdentifier:@"cell1"];

if (nil == cell) {

cell = [[UITableViewCellalloc]initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:@"cell1"];

UIImageView *imageView = [[UIImageViewalloc]initWithFrame:CGRectMake(6,6, 35, 35)];

imageView.image = [UIImageimageNamed:@"Dot.png"];

//contentView

[cell.contentView addSubview:imageView];

}

else if (indexPath.section ==1) {

cell = [tableView dequeueReusableCellWithIdentifier:@"cell2"];

if (nil == cell) {

cell = [[UITableViewCellalloc]initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:@"cell2"];

}

switch (indexPath.row) {

case 0:

cell.textLabel.text =@"全部";

break;

case 1:

cell.textLabel.text =@"文档";

break;

case 2:

cell.textLabel.text =@"图片";

break;

case 3:

cell.textLabel.text =@"音频";

break;

default:

break;

}

else if (indexPath.section ==2) {

cell = [tableView dequeueReusableCellWithIdentifier:@"cell3"];

if (nil == cell) {

cell = [[UITableViewCellalloc]initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:@"cell3"];

}

switch (indexPath.row) {

case 0:

cell.textLabel.text =@"本地相册";

break;

case 1:

cell.textLabel.text =@"网盘相册";

break;

default:

break;

}

cell.backgroundColor = [UIColorclearColor];

return cell;

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

return 3;

}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

NSString *title = nil;

if (section == 0) {

title = @"SugarPhoto";

}

if (section == 1) {

title = @"我的文件";

}

if (section == 2) {

title = @"文件来源";

}

return title;

}

//uitableView Delegate

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

CGFloat key;

if (indexPath.section ==0) {

key = 50;

}

if (indexPath.section ==1 || indexPath.section == 2) {

key = 44;

}

return key;

}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section

{

return 35;

}