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UITableView 系列五 :自定义UITableViewCell (实例)

2013-02-25 09:42 369 查看
有时候我们需要自己定义UITableViewCell的风格,其实就是向行中添加子视图。添加子视图的方法主要有两种:使用代码以及从.xib文件加载。当然后一种方法比较直观。

我们这次要自定义一个Cell,使得它像QQ好友列表的一行一样:左边是一张图片,图片的右边是三行标签:



当然,我们不会搞得这么复杂,只是有点意思就行。

1、运行Xcode 4.2,新建一个Single View Application,名称为Custom Cell:



2、将图片资源导入到工程。为此,我找了14张50×50的.png图片,名称依次是1、2、……、14,放在一个名为Images的文件夹中。将此文件夹拖到工程中,在弹出的窗口中选中Copy items into…



添加完成后,工程目录如下:



3、创建一个UITableViewCell的子类:选中Custom Cell目录,依次选择File — New — New File,在弹出的窗口,左边选择Cocoa Touch,右边选择Objective-C class:



之后选择Next和Create,就建立了两个文件:CustomCell.h和CustomCell.m。

4、创建CustomCell.xib:依次选择File — New — New File,在弹出的窗口,左边选择User Interface,右边选择Empty:



单击Next,选择iPhone,再单击Next,输入名称为CustomCell,选择好位置:



单击Create,这样就创建了CustomCell.xib。

5、打开CustomCell.xib,拖一个Table View Cell控件到面板上:



选中新加的控件,打开Identity Inspector,选择Class为CustomCell;然后打开Size Inspector,调整高度为60。

6、向新加的Table View Cell添加控件:拖放一个ImageView控件到左边,并设置大小为50×50。然后在ImageView右边添加三个Label,设置标签字号,最上边的是14,其余两个是12:



接下来向CustomCell.h添加Outlet映射,将ImageView与三个Label建立映射,名称分别为imageView、nameLabel、decLabel以及locLable,分别表示头像、昵称、个性签名,地点。

选中Table View Cell,打开Attribute Inspector,将Identifier设置为CustomCellIdentifier:



为了充分使用这些标签,还要自己创建一些数据,存在plist文件中,后边会做。

7、打开CustomCell.h,添加属性:

C代码







@property (copy, nonatomic) UIImage *image; @property (copy, nonatomic) NSString *name; @property (copy, nonatomic) NSString *dec; @property (copy, nonatomic) NSString *loc;

@property (copy, nonatomic) UIImage *image;
@property (copy, nonatomic) NSString *name;
@property (copy, nonatomic) NSString *dec;
@property (copy, nonatomic) NSString *loc;

8、打开CustomCell.m,向其中添加代码:

8.1 在@implementation下面添加代码:

C代码







@synthesize image; @synthesize name; @synthesize dec; @synthesize loc;

@synthesize image;
@synthesize name;
@synthesize dec;
@synthesize loc;


8.2 在@end之前添加代码:

C代码







- (void)setImage:(UIImage *)img { if (![img isEqual:image]) { image = [img copy]; self.imageView.image = image; } } -(void)setName:(NSString *)n { if (![n isEqualToString:name]) { name = [n copy]; self.nameLabel.text = name; } } -(void)setDec:(NSString *)d { if (![d isEqualToString:dec]) { dec = [d copy]; self.decLabel.text = dec; } } -(void)setLoc:(NSString *)l { if (![l isEqualToString:loc]) { loc = [l copy]; self.locLabel.text = loc; } }

- (void)setImage:(UIImage *)img {
if (![img isEqual:image]) {
image = [img copy];
self.imageView.image = image;
}
}

-(void)setName:(NSString *)n {
if (![n isEqualToString:name]) {
name = [n copy];
self.nameLabel.text = name;
}
}

-(void)setDec:(NSString *)d {
if (![d isEqualToString:dec]) {
dec = [d copy];
self.decLabel.text = dec;
}
}

-(void)setLoc:(NSString *)l {
if (![l isEqualToString:loc]) {
loc = [l copy];
self.locLabel.text = loc;
}
}


这相当于重写了各个set函数,从而当执行赋值操作时,会执行我们自己写的函数。

好了,现在自己定义的Cell已经可以使用了。

不过在此之前,我们先新建一个plist,用于存储想要显示的数据。建立plist文件的方法前面的文章有提到。我们建好一个friendsInfo.plist,往其中添加数据如下:



注意每个节点类型选择。

9、打开ViewController.xib,拖一个Table View到视图上,并将Delegate和DataSource都指向File’ Owner,就像上一篇文章介绍的一样。

10、打开ViewController.h,向其中添加代码:

C代码







#import <UIKit/UIKit.h> @interface ViewController : UIViewController<UITableViewDelegate, UITableViewDataSource> @property (strong, nonatomic) NSArray *dataList; @property (strong, nonatomic) NSArray *imageList; @end

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UITableViewDelegate, UITableViewDataSource>
@property (strong, nonatomic) NSArray *dataList;
@property (strong, nonatomic) NSArray *imageList;
@end


11、打开ViewController.m,添加代码:

11.1 在首部添加:

C代码







#import "CustomCell.h"

#import "CustomCell.h"


11.2 在@implementation后面添加代码:

C代码







@synthesize dataList; @synthesize imageList;

@synthesize dataList;
@synthesize imageList;


11.3 在viewDidLoad方法中添加代码:

C代码







- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

//加载plist文件的数据和图片
NSBundle *bundle = [NSBundle mainBundle];
NSURL *plistURL = [bundle URLForResource:@"friendsInfo" withExtension:@"plist"];

NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfURL:plistURL];

NSMutableArray *tmpDataArray = [[NSMutableArray alloc] init];
NSMutableArray *tmpImageArray = [[NSMutableArray alloc] init];
for (int i=0; i<[dictionary count]; i++) {
NSString *key = [[NSString alloc] initWithFormat:@"%i", i+1];
NSDictionary *tmpDic = [dictionary objectForKey:key];
[tmpDataArray addObject:tmpDic];

NSString *imageUrl = [[NSString alloc] initWithFormat:@"%i.png", i+1];
UIImage *image = [UIImage imageNamed:imageUrl];
[tmpImageArray addObject:image];
}
self.dataList = [tmpDataArray copy];
self.imageList = [tmpImageArray copy];
}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//加载plist文件的数据和图片
NSBundle *bundle = [NSBundle mainBundle];
NSURL *plistURL = [bundle URLForResource:@"friendsInfo" withExtension:@"plist"];

NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfURL:plistURL];

NSMutableArray *tmpDataArray = [[NSMutableArray alloc] init];
NSMutableArray *tmpImageArray = [[NSMutableArray alloc] init];
for (int i=0; i<[dictionary count]; i++) {
NSString *key = [[NSString alloc] initWithFormat:@"%i", i+1];
NSDictionary *tmpDic = [dictionary objectForKey:key];
[tmpDataArray addObject:tmpDic];

NSString *imageUrl = [[NSString alloc] initWithFormat:@"%i.png", i+1];
UIImage *image = [UIImage imageNamed:imageUrl];
[tmpImageArray addObject:image];
}
self.dataList = [tmpDataArray copy];
self.imageList = [tmpImageArray copy];
}


11.4 在ViewDidUnload方法中添加代码:

C代码







self.dataList = nil; self.imageList = nil;

self.dataList = nil;
self.imageList = nil;


11.5 在@end之前添加代码:

C代码







#pragma mark -
#pragma mark Table Data Source Methods

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.dataList count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CustomCellIdentifier = @"CustomCellIdentifier";

static BOOL nibsRegistered = NO;
if (!nibsRegistered) {
UINib *nib = [UINib nibWithNibName:@"CustomCell" bundle:nil];
[tableView registerNib:nib forCellReuseIdentifier:CustomCellIdentifier];
nibsRegistered = YES;
}

CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];

NSUInteger row = [indexPath row];
NSDictionary *rowData = [self.dataList objectAtIndex:row];

cell.name = [rowData objectForKey:@"name"];
cell.dec = [rowData objectForKey:@"dec"];
cell.loc = [rowData objectForKey:@"loc"];
cell.image = [imageList objectAtIndex:row];

return cell;
}

#pragma mark Table Delegate Methods

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 60.0;
}

- (NSIndexPath *)tableView:(UITableView *)tableView
willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
return nil;
}

#pragma mark -
#pragma mark Table Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.dataList count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CustomCellIdentifier = @"CustomCellIdentifier";

static BOOL nibsRegistered = NO;
if (!nibsRegistered) {
UINib *nib = [UINib nibWithNibName:@"CustomCell" bundle:nil];
[tableView registerNib:nib forCellReuseIdentifier:CustomCellIdentifier];
nibsRegistered = YES;
}

CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];

NSUInteger row = [indexPath row];
NSDictionary *rowData = [self.dataList objectAtIndex:row];

cell.name = [rowData objectForKey:@"name"];
cell.dec = [rowData objectForKey:@"dec"];
cell.loc = [rowData objectForKey:@"loc"];
cell.image = [imageList objectAtIndex:row];

return cell;
}

#pragma mark Table Delegate Methods
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 60.0;
}

- (NSIndexPath *)tableView:(UITableView *)tableView
willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
return nil;
}


12、运行:



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