帶有用戶名的iOS導航欄

Question

我們如何處理向導航欄標題顯示http發布的用戶名？ 這是一個成功顯示UIScrollView*listview;人們拍攝的jpeg代表照片中的用戶名的方法UIScrollView*listview;

-(id)initWithIndex:(int)i andData:(NSDictionary*)data {
self = [super init];
if (self !=nil) {
    //initialize
    self.tag = [[data objectForKey:@"IdPhoto"] intValue];
    int row = i/3;
    int col = i % 3;
    self.frame = CGRectMake(1.5*kPadding+col*(kThumbSide+kPadding), 1.5*kPadding+row*(kThumbSide+kPadding), kThumbSide, kThumbSide);
    self.backgroundColor = [UIColor grayColor];
    //add the photo caption
    UILabel* caption = [[UILabel alloc] initWithFrame:CGRectMake(0, kThumbSide-16, kThumbSide, 16)];
    caption.backgroundColor = [UIColor blackColor];
    caption.textColor = [UIColor whiteColor];
    caption.textAlignment = UITextAlignmentCenter;
    caption.font = [UIFont systemFontOfSize:12];
    caption.text = [NSString stringWithFormat:@"@%@",[data objectForKey:@"username"]];
    [self addSubview: caption];
    //add touch event
    [self addTarget:delegate action:@selector(didSelectPhoto:) forControlEvents:UIControlEventTouchUpInside];
    //load the image
    API* api = [API sharedInstance];
    int IdPhoto = [[data objectForKey:@"IdPhoto"] intValue];
    NSURL* imageURL = [api urlForImageWithId:[NSNumber numberWithInt: IdPhoto] isThumb:YES];
    AFImageRequestOperation* imageOperation = [AFImageRequestOperation imageRequestOperationWithRequest: [NSURLRequest requestWithURL:imageURL] success:^(UIImage *image) {
        //create an image view, add it to the view
        UIImageView* thumbView = [[UIImageView alloc] initWithImage: image];
        thumbView.frame = CGRectMake(0,0,90,90);
        thumbView.contentMode = UIViewContentModeScaleAspectFit;
        [self insertSubview: thumbView belowSubview: caption];
    }];
    NSOperationQueue* queue = [[NSOperationQueue alloc] init];
    [queue addOperation:imageOperation];
}
return self;
}

Answer 1

在標簽接收信息后，將self.navigationItem.title = label放在與-(void)initWithIndex:(int)i andData:(NSDictionary*)data方法相同的方法中。

-(void)initWithIndex:(int)i andData:(NSDictionary*)data {

    //remove the "@" from before the %@ that you have below

    label = [NSString stringWithFormat:@"@%@",[data objectForKey:@"username"]];

    self.navigationItem.title = label;
}

根據是否需要立即加載，您應該在viewDidLoad或viewWillAppear方法中調用-(void)initWithIndex:(int)i andData:(NSDictionary*)data 。

UPDATE

試試這個：

   [self.navigationItem setTitle: label];

由於某種原因，這更好。 我在測試中試過了兩個，這個對我有用。

更新2

使用值/對象初始化標簽。

-(void)viewDidLoad{

    label = @"";//initialises the value to be a blank string enabling use
    //call your method that assigns the title now.

}

現在，當調用方法-(void)initWithIndex:(int)i andData:(NSDictionary*)data ，標題應該在標簽初始化時更新，現在將更新它的值。

更新3 - 根據要求提供

在.m文件的頂部

@interface YourClassName ()
{
    NSString * label;
}

@end

@implementation YourClassName

-(void)viewDidLoad{

    label = @"";//initialises the value to be a blank string enabling use

}

-(void)initWithIndex:(int)i andData:(NSDictionary*)data {

    //remove the "@" from before the %@ that you have below

    label = [NSString stringWithFormat:@"@%@",[data objectForKey:@"username"]];
    //the label now has a new value so use it for title
    self.navigationItem.title = label;

    //test to see that there is a value available in log
    NSLog(@"What is the name: %@", label);
}