如何在 ViewDidLoad 中的 UILabel 中显示一个整数值？我为文本、日期和图像做了，但如何将 int 转换为字符串。我正在尝试使用以下代码

 NSString* label=[aa stringWithFormat:@"%d",((Comments *) [self.list objectAtIndex:0]).noofcomm]]; 
 [self.comments2 setText:label];

但没有用。请帮助我。如何使用 UILabel 设置整数？

这是我的评论.h

    @interface Comments : NSObject
{
    NSInteger iD;
    UIImage *photo;
    NSString *name;
    NSString *descrp;
    NSDate *date;
    NSString *msg;
    NSInteger noofcomm;
    NSInteger nooflikes;
}
@property(nonatomic,assign)NSInteger iD;
@property(nonatomic,retain)UIImage *photo;
@property(nonatomic,retain)NSString *name;
@property(nonatomic,retain)NSString *descrp;
@property(nonatomic,strong)NSDate *date;
@property(nonatomic,retain)NSString *msg;
@property(nonatomic,assign)NSInteger noofcomm;
@property(nonatomic,assign)NSInteger nooflikes;


@end

数据库类.m

     #import "DBClass.h"
#import "Comments.h"

@implementation DBClass
- (NSMutableArray *) getMyComments{
    NSMutableArray *wineArray = [[NSMutableArray alloc] init];
    @try {
        NSFileManager *fileMgr = [NSFileManager defaultManager];
        NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"ComntDB.sqlite"];
        BOOL success = [fileMgr fileExistsAtPath:dbPath];
        if(!success)
        {
            NSLog(@"Cannot locate database file '%@'.", dbPath);
        }
        if(!(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK))
        {
            NSLog(@"An error has occured.");
        }
        const char *sql = "SELECT id, photo,name,descrp, time,msg,comments,likes FROM Com";
        sqlite3_stmt *sqlStatement;
        if(sqlite3_prepare(db, sql, -1, &sqlStatement, NULL) != SQLITE_OK)
        {
            NSLog(@"Problem with prepare statement");
        }

        //
        while (sqlite3_step(sqlStatement)==SQLITE_ROW) {
            Comments *MyWine = [[Comments alloc]init];

            MyWine.iD = sqlite3_column_int(sqlStatement, 0);

            const char *raw = sqlite3_column_blob(sqlStatement, 1);
            int rawLen = sqlite3_column_bytes(sqlStatement, 1);
            NSData *data = [NSData dataWithBytes:raw length:rawLen];
            MyWine.photo = [[UIImage alloc] initWithData:data];
            MyWine.name = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,2)];

            MyWine.descrp = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 3)];

            MyWine.date=[NSDate dateWithTimeIntervalSince1970:sqlite3_column_double(sqlStatement,4)];
             MyWine.msg = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,5)];
            MyWine.noofcomm = sqlite3_column_int(sqlStatement, 6);
            MyWine.nooflikes = sqlite3_column_int(sqlStatement, 7);

            [wineArray addObject:MyWine];
        }
    }
    @catch (NSException *exception) {
        NSLog(@"An exception occured: %@", [exception reason]);
    }
    @finally {
        return wineArray;
    }

}

@end

RootViewController.m

    #import "RootViewController.h"
#import "Comments.h"
#import "DBClass.h"

@interface RootViewController ()

@end

@implementation RootViewController
@synthesize list;
@synthesize image2;
@synthesize name2;
@synthesize descrp2;
@synthesize msg2;
@synthesize date2;
@synthesize comments2;
@synthesize likes2;

- (void)viewDidLoad
{
    DBClass * mywines =[[DBClass alloc] init];
    self.list = [mywines getMyComments];
    [self.image2 setImage:((Comments *) [self.list objectAtIndex:0]).photo];
    [self.name2 setText:((Comments *) [self.list objectAtIndex:0]).name];

    [self.descrp2 setText:((Comments *) [self.list objectAtIndex:0]).descrp];

    NSDateFormatter* fmtr = [[NSDateFormatter alloc] init];
    [fmtr setDateFormat:@"MM/dd/yy"];
    NSString* label_str = [fmtr stringFromDate:((Comments *) [self.list objectAtIndex:0]).date];  
[self.date2 setText:label_str];
          [self.msg2 setText:((Comments *) [self.list objectAtIndex:0]).msg];
    //[self.comments2 setText:((Comments *) [self.list objectAtIndex:0]).noofcomm];
       // int solution = 1;
//    [self.comments2 setText:[NSString stringWithFormat:@"%d", solution]];
//    int solution2 = 1;
//    [self.likes2 setText:[NSString stringWithFormat:@"%d", solution2]];

    [super viewDidLoad];
}
- (void)viewDidUnload
{
    [self setImage2:nil];
    [self setName2:nil];
    [self setMsg2:nil];
    [self setDescrp2:nil];
    [self setComments2:nil];
    [self setLikes2:nil];
    [self setDate2:nil];
    [super viewDidUnload];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

最佳答案

NSInteger someInteger = myInteger;
NSString *someString = [NSString stringWithFormat:@"%d", someInteger];
myLabel.text = someString;

或

NSNumber *someNumber = @(myInteger);
NSString *someString = [someNumber stringValue];
myLabel.text = someString;

两者都可以。

编辑:

在您的情况下，它将是这样的:

NSInteger someInteger = ((Comments *) [self.list objectAtIndex:0]).noofcomm;
NSString someString = [NSString stringWithFormat:@"%d", someInteger];
self.comments2.text = someString;

如果仍然无法正常工作，则可以肯定问题出在其他地方，而不是转换。检查属性 noofcomm 是否具有有效值，检查您的标签引用是否正常(在转换前使用随机值进行测试)，以及诸如此类的事情。

关于ios - 在 Label 中显示 Integer 值，int 到 String 的转换？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18300767/