UITableView常用知识总结（转）

1：tableviewcell的宽度设置

在你的自定义的tableviewcell的m文件里加入下面方法：

view plain

1. -(void)layoutSubviews  
2. {  
3. [super layoutSubviews];  
4. CGRect frame = self.backgroundView.frame;  
5.     frame.origin.x += 18;  
6.     frame.size.width -= 36;  
7.     self.backgroundView.frame = frame;  
8.     frame = self.contentView.frame;  
9.     frame.origin.x += 18;  
10.     frame.size.width -= 36;  
11.     self.contentView.frame = frame;  
12. }  

 

重写了tableviewcell的layoutSubviews的方法，调整一下backgroundview和contentview的frame就行了。

 

UITableViewCell包含图像,文本等.

 

NSString *CellIdentifier = [ [ NSString alloc ] initWithString: @"Frank" ];

UITableViewCell *cell = [ [ [ UITableViewCell alloc ]

        initWithFrame: CGRectZero

        reuseIdentifier: CellIdentifier 

    ] autorelease

];

然后你可以为每一个cell设置不同的风格

(1) 显示文本: cell.text = @"Frank's Table Cell";

(2) 对齐: cell.textAlignment = UITextAlignmentLeft;
UITextAlignmentLeft 默认是左对齐

   UITextAlignmentRight 右对齐

   UITextAlignmentCenter 中对齐

(3) 字体和尺寸:

#import <UIKit/UIFont.h>

UIFont *myFont = [ UIFont fontWithName: @"Arial" size: 18.0 ]; 

cell.font = myFont;

//系统字体

UIFont *mySystemFont = [ UIFont systemFontOfSize: 12.0 ];

UIFont *myBoldSystemFont = [ UIFont boldSystemFontOfSize: 12.0 ];

UIFont *myItalicSystemFont = [ UIFont italicSystemFontOfSize: 12.0 ];

(4) 颜色

#import <UIKit/UIColor.h>

//文本颜色

cell.textColor = [ UIColor redColor ];

//当前选择项的颜色

cell.selectedTextColor = [ UIColor blueColor ];

(5) 图像

//从你应用程序目录下的文件创建一个image

cell.image = [ UIImage imageNamed: @"cell.png" ];

//当前选中项的图形

cell.selectedImage = [ UIImage imageNamed: @"selected_cell.png" ];

可以修改table保准行高来适应你的图形高度

- (id)init 

{

    self = [ super init ];

    if (self != nil) {

        self.tableView.rowHeight = 65; 

    }

    return self; 

}

你也可以为每一个cell定义不同的高度

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

{

    if ([ indexPath indexAtPosition: 1 ] == 0)

        return 65.0; 

    else

        return 40.0; 

}

(6)选中项的风格

cell.selectionStyle = UITableViewCellSelectionStyleBlue;

UITableViewCellSelectionStyleBlue 默认选中项是蓝色

UITableViewCellSelectionStyleGray 灰色

UITableViewCellSelectionStyleNone 没有变化


(7)标签 (labels)


在偏移量100x0处创建一个尺寸50x50 label:

UILabel *label = [ [ UILabel alloc ] initWithFrame: CGRectMake(100.0, 0.0, 50.0, 50.0) ];

label.text = @"Label Text";

label.textAlignment = UITextAlignmentLeft;

label.textColor = [ UIColor redColor ];

label.font = [ UIFont fontWithName: @"Arial" size: 10.0 ];

标签label可以设置文本阴影,甚至可以定义阴影的偏移:

label.shadowColor = [ UIColor grayColor ];

label.shadowOffset = CGSizeMake(0, -1);

高亮是的颜色:

label.highlightedTextColor = [ UIColor blackColor ];

标签的背景色:

label.backgroundColor = [ UIColor blueColor ];

把标签加到cell里

[ cell addSubview: label ];

(8) 附件

cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

Style Description

UITableViewCellAccessoryNone	没有附件
UITableViewCellAccessoryDisclosureIndicator	黑色向右的箭头
UITableViewCellAccessoryDetailDisclosureButton	蓝色附件按钮
UITableViewCellAccessoryCheckmark	复选框,支持选择

 

7.3 实现多选

- (void)tableView:(UITableView *)tableView

        didSelectRowAtIndexPath:(NSIndexPath *)indexPath 

{

    NSLog(@"Selected section %d, cell %d", 

        [ indexPath indexAtPosition: 0 ], [ indexPath indexAtPosition: 1 ]); 

    //获的当前选择项

    UITableViewCell *cell = [ self.tableView cellForRowAtIndexPath: indexPath ]; 

    //显示复选框

    if (cell.accessoryType == UITableViewCellAccessoryNone)

        cell.accessoryType = UITableViewCellAccessoryCheckmark;

    else

        cell.accessoryType = UITableViewCellAccessoryNone; 

}

7.4 编辑和删除

在允许用户删除和编辑的时候,每一个cell左边会显示一个红色删除图标

[ self.tableView setEditing:YES animated:YES ];

关闭编辑的时候,table顶部会显示一个Edit导航条

[ self.tableView setEditing: NO animated: YES ];

在编辑过程中,如果用户要删除该项,会弹出一个删除确认框. 确认后调UITableViewDataSource类的commitEditingStyle方法来通知你的应用程序, 然后你可以从你的底层数据源里删除该项,并通知table view删除该行.

- (void)tableView:(UITableView *)tableView

    commitEditingStyle:(UITableViewCellEditingStyle) editingStyle

    forRowAtIndexPath:(NSIndexPath *) indexPath 

{

    if (editingStyle == UITableViewCellEditingStyleDelete) 

    {

        NSLog(@"Deleted section %d, cell %d", [ indexPath indexAtPosition: 0 ], [ indexPath indexAtPosition: 1 ]);

        NSMutableArray *array = [ [ NSMutableArray alloc ] init ];

        [ array addObject: indexPath ];

        [ self.tableView deleteRowsAtIndexPaths: array

            withRowAnimation: UITableViewRowAnimationFade 

        ];

     }

}

通过传递一个数组给deleteRowsAtIndexPaths方法, 可以删除一行或多行.

 

withRowAnimation至此下列预定义的删除动画

 

Animation Description

UITableViewRowAnimationFade	Cell fades out
UITableViewRowAnimationRight	Cell slides out from right
UITableViewRowAnimationLeft	Cell slides out from left
UITableViewRowAnimationTop	Cell slides out to top of adjacent cell
UITableViewRowAnimationBottom	Cell slides out to bottom of adjacent cell

 

7.5 重新加载表

当你的数据变了的时候,你可以重新加载整个表

[ self.tableView reloadData ];

7.6 TableDemo: Simple File Browser

这个例子列表你应用程序home目录里的文件和目录

 

(1) TableDemo main (main.m)

#import <UIKit/UIKit.h>

int main(int argc, char *argv[])

{

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    int retVal = UIApplicationMain(argc, argv, nil, @"TableDemoAppDelegate");

    [pool release];

    return retVal; 

}

(2)TableDemo application delegate

prototypes (TableDemoAppDelegate.h)

 

#import <UIKit/UIKit.h>

@class TableDemoViewController;

@interface TableDemoAppDelegate : NSObject <UIApplicationDelegate> 

{

    UIWindow *window;

    TableDemoViewController *viewController;

    UINavigationController *navigationController;

}

@property (nonatomic, retain) IBOutlet UIWindow *window;

@property (nonatomic, retain) IBOutlet TableDemoViewController *viewController;

@end

(TableDemoAppDelegate.m)

#import "TableDemoAppDelegate.h"

#import "TableDemoViewController.h"

@implementation TableDemoAppDelegate

@synthesize window;

@synthesize viewController;

- (void)applicationDidFinishLaunching:(UIApplication *)application {

    CGRect screenBounds = [ [ UIScreen mainScreen ] bounds ];

    self.window = [ [ [ UIWindow alloc ] initWithFrame: screenBounds ] autorelease ];

    viewController = [ [ TableDemoViewController alloc ] init ];

    navigationController = [ [ UINavigationController alloc ] init

        WithRootViewController: viewController

    ];

    [ window addSubview: [ navigationController view ] ];

    [ window makeKeyAndVisible ];

}

- (void)dealloc {

    [viewController release];

    [window release];

    [super dealloc];

}

@end

(3) TableDemo view controller

prototype (TableDemoViewController.h)

#import <UIKit/UIKit.h>

@interface TableDemoViewController : UITableViewController {

    NSMutableArray *fileList;

}

- (void) startEditing;

- (void) stopEditing;

- (void) reload;

@end

(TableDemoViewController.m)

#import "TableDemoViewController.h"

@implementation TableDemoViewController 

- (id)init {

    self = [ super init ];

    if (self != nil) {

        [ self reload ];

        self.navigationItem.rightBarButtonItem = [ [ [ UIBarButtonItem alloc ]

            initWithBarButtonSystemItem: UIBarButtonSystemItemEdit

            target: self

            action: @selector(startEditing)

            ] autorelease 

        ];

        self.navigationItem.leftBarButtonItem = [ [ [ UIBarButtonItem alloc ]

            initWithTitle:@"Reload"

            style: UIBarButtonItemStylePlain

            target: self

            action:@selector(reload) 

            ] autorelease

        ]; 

    }

    return self;

}

- (void) stopEditing {

    [ self.tableView setEditing: NO animated: YES ];

    self.navigationItem.rightBarButtonItem

    = [ [ [ UIBarButtonItem alloc ]

       initWithBarButtonSystemItem: UIBarButtonSystemItemEdit

       target: self

       action: @selector(startEditing) ] autorelease ];

}

- (void) reload {

    NSDirectoryEnumerator *dirEnum;

    NSString *file;

    fileList = [ [ NSMutableArray alloc ] init ];

    dirEnum = [ [ NSFileManager defaultManager ] enumeratorAtPath:

        NSHomeDirectory()

    ];

    while ((file = [ dirEnum nextObject ])) {

        [ fileList addObject: file ];

    }

    [ self.tableView reloadData ];

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return 1;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsIn

Section:(NSInteger)section {

    return [ fileList count ];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRow

AtIndexPath:(NSIndexPath *)indexPath {

    NSString *CellIdentifier = [ fileList objectAtIndex:

        [ indexPath indexAtPosition: 1 ]

    ];

    UITableViewCell *cell = [ tableView

        dequeueReusableCellWithIdentifier: CellIdentifier

    ];

    if (cell == nil) {

        cell = [ [ [ UITableViewCell alloc ] initWithFrame:

            CGRectZero reuseIdentifier: CellIdentifier ] autorelease

        ];

        cell.text = CellIdentifier;

        UIFont *font = [ UIFont fontWithName: @"Courier" size: 12.0 ];

        cell.font = font;

    }

    return cell;

}

- (void)tableView:(UITableView *)tableView

    commitEditingStyle:(UITableViewCellEditingStyle) editingStyle

    forRowAtIndexPath:(NSIndexPath *) indexPath

{

    if (editingStyle == UITableViewCellEditingStyleDelete) {

        UITableViewCell *cell = [ self.tableView cellForRowAtIndexPath:

            indexPath ];

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

            if ([ cell.text isEqualToString: [ fileList objectAtIndex: i ] ]) {

                [ fileList removeObjectAtIndex: i ];

            }

        }

        NSMutableArray *array = [ [ NSMutableArray alloc ] init ];

        [ array addObject: indexPath ];

        [ self.tableView deleteRowsAtIndexPaths: array

            withRowAnimation: UITableViewRowAnimationTop

        ];

    }

}

- (void)tableView:(UITableView *)tableView didSelectRowAt

IndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [ self.tableView cellForRowAtIndexPath: indexPath ];

    UIAlertView *alert = [ [ UIAlertView alloc ] initWithTitle: @"File Selected"

        message: [ NSString stringWithFormat: @"You selected the file '%@'",

                       cell.text ]

        delegate: nil

        cancelButtonTitle: nil

        otherButtonTitles: @"OK", nil

    ];

    [ alert show ];

}

- (void)loadView {

    [ super loadView ];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterface

Orientation)interfaceOrientation {

    return YES;

}

- (void)didReceiveMemoryWarning {

    [ super didReceiveMemoryWarning ];

}

- (void)dealloc {

    [ fileList release ];

    [ super dealloc ];

}

@end

 

转载自：http://blog.sina.com.cn/s/articlelist_1654117677_0_1.html（这个作者还有很多关于tableview的使用指南，赞一个！！！用到常看看）