点击tableView中的cell 相应的改变navgationbar的背景色

来源：互联网发布：全球票房数据库编辑：程序博客网时间：2024/04/28 17:18

1.让tableView分组显示并设置navgationbar的title

-(tableview *)init{    if(self = [super initWithStyle:UITableViewStyleGrouped])    {        self.title = @"ColorTransitation";    }    return self ;}

2.tableView 所需的数据

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return [sectionArray count];}-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return [[sectionArray objectAtIndex:section] count];}-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ColorTranslation"];    if(cell == nil)    {        cell = [[UITableViewCell alloc]initWithFrame:CGRectZero reuseIdentifier:@"ColorTranslation"];    }        NSInteger row = [indexPath row];    NSInteger section = [indexPath section];        NSArray *arrays = [[[sectionArray objectAtIndex:section] objectAtIndex:row]                                              componentsSeparatedByString:@"#"];    cell.text = [arrays objectAtIndex:0];    cell.textColor = [self getColor:[arrays objectAtIndex:1]];        return cell ;}

3。定义得到颜色的函数

-(UIColor *)getColor:(NSString *)hexColor{    unsigned int red,green,blue;    NSRange      range ;        range.length = 2 ;    range.location = 0 ;    [[NSScanner scannerWithString:[hexColor substringWithRange:range]]scanHexInt:&red];    range.location = 2 ;    [[NSScanner scannerWithString:[hexColor substringWithRange:range]]scanHexInt:&green];    range.location = 4 ;    [[NSScanner scannerWithString:[hexColor substringWithRange:range]]scanHexInt:&blue];         return [UIColor colorWithRed:(float)(red/255.0f) green:(float)(green/255.0f)                              blue:(float)(blue/255.0f) alpha:1.0f];    }

4. tableView 的委托方法

-(void)deselect{    [self.tableView deselectRowAtIndexPath:[self.tableView indexPathForSelectedRow] animated:YES];}-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    NSInteger row = [indexPath row];    NSInteger section = [indexPath section];    NSArray *arrays = [[[sectionArray objectAtIndex:section]objectAtIndex:row]                         componentsSeparatedByString:@"#"];        self.navigationController.navigationBar.tintColor = [self getColor:[arrays objectAtIndex:1]];    [self performSelector:@selector(deselect) withObject:NULL afterDelay:0.5];}

5.显示 tableView

-(void)createSectionList:(id)wordArray{    sectionArray = [[[NSMutableArray alloc]init]retain];    for(int i=0;i<26;i++) [sectionArray addObject:[[[NSMutableArray alloc]init]retain]];    for(NSString *word in wordArray)    {        if([word length]==0) continue ;        NSRange range = [ALPHA rangeOfString:[[word substringToIndex:1]uppercaseString]];        [[sectionArray objectAtIndex:range.location] addObject:word];    }}-(void)loadView{    [super loadView];    NSString *pathname = [[NSBundle mainBundle] pathForResource:@"crayons" ofType:@"txt" inDirectory:@"/"];    NSString *wordstring = [NSString stringWithContentsOfFile:pathname];    NSArray  *wordArray = [[wordstring componentsSeparatedByString:@"\n"]retain];        [self createSectionList:wordArray];}