UITableView常用知识总结（转）

最新推荐文章于 2016-09-06 09:46:28 发布

jaybril

最新推荐文章于 2016-09-06 09:46:28 发布

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分类专栏： ios开发

本文链接：https://blog.youkuaiyun.com/gjj0981/article/details/84474748

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本文详细介绍了iOS开发的基础知识，包括Swift语言的特点、常用框架和库的应用，以及如何进行高效编码和调试。同时，文章还分享了实战经验，帮助开发者提升iOS应用的性能和用户体验。

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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
     
-(void)layoutSubviews  
{  
[super layoutSubviews];  
CGRect frame = self.backgroundView.frame;  
    frame.origin.x += 18;  
    frame.size.width -= 36;  
    self.backgroundView.frame = frame;  
    frame = self.contentView.frame;  
    frame.origin.x += 18;  
    frame.size.width -= 36;  
    self.contentView.frame = frame;  
}  

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）