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导航条加阴影效果
开发十年,就只剩下这套Java开发体系了   

想实现导航条有阴影效果,就是导航条看起来有立体感,阴影是渐渐变浅。有什么方法或者思路可以实现呢?
不要直接加图片的效果,

- (void)loadView {

    self.title=@"testNav";   //设置当前标题
    v1=[[UIView alloc]initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0)];
   
    tableview=[[UITableView alloc]initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0)  style: UITableViewStyleGrouped];
    [tableview setDelegate:self];
    [tableview setDataSource:self];   
    [tableview reloadData];
    [v1 addSubview: tableview];
       
    self.view=v1;
    UIBarButtonItem *inputbutton = [[UIBarButtonItem alloc]initWithTitle:@"logoout" style:UIBarButtonItemStylePlain target:self action:@selector(bb)];
    self.navigationItem.leftBarButtonItem = inputbutton;
    CGRect frame = CGRectMake(0, 0, 400, 44);
    label = [[[UILabel alloc] initWithFrame:frame] autorelease];
    label.backgroundColor = [UIColor clearColor];
    label.font = [UIFont boldSystemFontOfSize:20.0];
    label.textColor = [UIColor whiteColor];
    self.navigationItem.titleView = label;
    label.text = NSLocalizedString(@"ステータス", @"");   
    topShadow = [[self shadowAsInverse:YES] retain];
    [label.layer insertSublayer:topShadow atIndex:0];
}
- (CAGradientLayer *)shadowAsInverse:(BOOL)inverse
{
    CAGradientLayer *newShadow = [[[CAGradientLayer alloc] init] autorelease];
    CGRect newShadowFrame =    CGRectMake(0.0, 44.0,400.0,inverse ? SHADOW_INVERSE_HEIGHT : SHADOW_HEIGHT);
    newShadow.frame = newShadowFrame;
    CGColorRef darkColor = [UIColor blackColor];
    CGColorRef lightColor =    [UIColor whiteColor];
    newShadow.colors = [NSArray arrayWithObjects:lightColor,darkColor,nil];
    return newShadow;
}
-(NSInteger)numberOfRowsInSection:(NSInteger)section//tableview输出的组数
{
    NSLog(@"erqetwq");
    return 3;
}



- (void)dealloc
{
    [super dealloc];
}


#pragma mark UIViewController delegate methods

- (void)viewWillAppear:(BOOL)animated
{
    NSIndexPath *tableSelection = [tableview indexPathForSelectedRow];
    [tableview deselectRowAtIndexPath:tableSelection animated:NO];
}


#pragma mark UITableView delegate methods

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section//一组输出的几行数据
{                                                                                                                   
    return 3;
}
//选择项后的事件响应
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   
    ButtonsViewController *buttonsViewController = [[ButtonsViewController alloc] init];
    [self.navigationController pushViewController:buttonsViewController animated:YES];
    NSLog(@"clicked item");
    [ButtonsViewController release];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellIdentifier];
        if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:kCellIdentifier] autorelease];
    }
    switch (indexPath.row) {
        case 0:
            cell.text = @"1 second view";
            break;
        case 1:
            cell.text = @"2 second view";
            break;
        case 2:
            cell.text = @"3 second view";
            break;
        default:
            break;
    }
    return cell;
}

我是这样写的,但这个View还没加载完就崩溃了。麻烦高手指点一下吧


原文链接:http://www.cnblogs.com/chen1987lei/archive/2011/06/07/2074643.html
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长平狐
发帖于6年前 0回/243阅
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