iOS IBOutlet UILabel Duplicate

Screenshot iOS IBOutlet UILabel Duplicate

在截图中，fork和knife之后的标签呈现两次。以下代码中的标签为budgetLabel。只需将IBOutlet添加到故事板中的标签，而不是在代码中创建。这是怎么发生的？我不知道。

// 
// LogViewController.m 
// Calorie 
// 
// Created by 但 江 on 13-12-8. 
// Copyright (c) 2013年 Dan Thought Studio. All rights reserved. 
// 

#import "DTLogsViewController.h" 
#import "DTAlertView.h" 
#import "DTBlankView.h" 
#import "DTCircleView.h" 
#import "DTCalendarHeader.h" 
#import "DTLogHeader.h" 
#import "DTLogCell.h" 
#import "DTRectangleView.h" 
#import "DTPercentView.h" 
#import "DTTheme.h" 
#import "DTUserDefaults.h" 
#import "DTDataManager.h" 
#import "DTUnitConverter.h" 
#import "DTContextObserver.h" 
#import "NSDate+Extend.h" 
#import "DTDevice.h" 
#import "DTConstant.h" 
#import "DTLog.h" 

static NSString * const DTLogHeaderIdentifier = @"LogHeader"; 
static NSString * const DTLogCellIdentifier = @"LogCell"; 
static NSString * const DTCalendarCellIdentifier = @"CalendarCell"; 

@interface DTLogsViewController() <UITableViewDataSource, UITableViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, DTContextObserverDelegate> 

@property (nonatomic, weak) IBOutlet NSLayoutConstraint *burnCircleLeading; 
@property (nonatomic, weak) IBOutlet NSLayoutConstraint *burnCircleTrailing; 
@property (nonatomic, weak) IBOutlet DTCircleView *intakeCircleView; 
@property (nonatomic, weak) IBOutlet DTCircleView *burnCircleView; 
@property (nonatomic, weak) IBOutlet DTCircleView *netCircleView; 
@property (nonatomic, weak) IBOutlet UILabel *intakeLabel; 
@property (nonatomic, weak) IBOutlet UILabel *burnLabel; 
@property (nonatomic, weak) IBOutlet UILabel *netLabel; 
@property (nonatomic, weak) IBOutlet UILabel *intakeUnit; 
@property (nonatomic, weak) IBOutlet UILabel *burnUnit; 
@property (nonatomic, weak) IBOutlet UILabel *netUnit; 
@property (nonatomic, weak) IBOutlet UILabel *dayLabel; 
@property (nonatomic, weak) IBOutlet UIImageView *budgetImageView; 
@property (nonatomic, weak) IBOutlet UILabel *budgetLabel; 
@property (nonatomic, weak) IBOutlet UILabel *recommendLabel; 
@property (nonatomic, weak) IBOutlet DTPercentView *percentView; 
@property (nonatomic, weak) IBOutlet UITableView *tableView; 
@property (nonatomic, weak) IBOutlet DTCalendarHeader *calendarHeader; 
@property (nonatomic, weak) IBOutlet UICollectionView *collectionView; 
@property (nonatomic, strong) DTBlankView *blankView; 
@property (nonatomic, strong) NSDate *date; 
@property (nonatomic, copy) NSArray *brands; 
@property (nonatomic, strong) DTContextObserver *observer; 
@property (nonatomic) CGFloat calendarCellWidth; 
@property (nonatomic) CGFloat calendarCellSpace; 

@end 

@implementation DTLogsViewController 

- (void)dealloc { 
    [[NSNotificationCenter defaultCenter] removeObserver:self name:DTPersistentStoreIsReadyNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self name:DTUserDefaultsOnlyUnitChangedNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self name:DTUserDefaultsExcludeUnitChangedNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationSignificantTimeChangeNotification object:[UIApplication sharedApplication]]; 
} 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    self.navigationController.tabBarItem.selectedImage = [UIImage imageNamed:@"notepad-full"]; 

    self.date = [NSDate new]; 

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(initDatas) name:DTPersistentStoreIsReadyNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(userDefaultsChanged) name:DTUserDefaultsOnlyUnitChangedNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(userDefaultsChanged) name:DTUserDefaultsExcludeUnitChangedNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(significantTimeChanged) name:UIApplicationSignificantTimeChangeNotification object:[UIApplication sharedApplication]]; 

    UIBarButtonItem *calendarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"calendar-normal"] style:UIBarButtonItemStylePlain target:self action:@selector(calendar)]; 
    UIBarButtonItem *tomorrowButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"right-arrow-line"] style:UIBarButtonItemStylePlain target:self action:@selector(tomorrow)]; 
    UIBarButtonItem *yesterdayButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"left-arrow-line"] style:UIBarButtonItemStylePlain target:self action:@selector(yesterday)]; 
    UIBarButtonItem *todayButtonItem = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"BackToToday", @"Back To Today Text") style:UIBarButtonItemStylePlain target:self action:@selector(today)]; 
    self.navigationItem.leftBarButtonItem = calendarButtonItem; 
    self.navigationItem.rightBarButtonItems = @[tomorrowButtonItem, yesterdayButtonItem, todayButtonItem]; 

    self.intakeCircleView.color = [DTTheme orangeColor]; 
    self.burnCircleView.color = [DTTheme greenColor]; 
    self.netCircleView.color = [DTTheme purpleColor]; 
    self.percentView.color = [DTTheme purpleColor]; 
    [self.tableView registerClass:[DTLogHeader class] forHeaderFooterViewReuseIdentifier:DTLogHeaderIdentifier]; 
    [self.tableView registerClass:[DTLogCell class] forCellReuseIdentifier:DTLogCellIdentifier]; 
    self.calendarCellWidth = CalendarItemWidthPhoneOther; 
    self.calendarCellSpace = CalendarItemSpacePhoneOther; 
    if ([DTDevice isPhone6Plus]) { 
     self.calendarCellWidth = CalendarItemWidthPhone6Plus; 
     self.calendarCellSpace = CalendarItemSpacePhone6Plus; 
    } else if ([DTDevice isPhone6]) { 
     self.calendarCellWidth = CalendarItemWidthPhone6; 
     self.calendarCellSpace = CalendarItemSpacePhone6; 
    } else if ([DTDevice isPadPortrait]) { 
     self.calendarCellWidth = CalendarItemWidthPadPortrait; 
     self.calendarCellSpace = CalendarItemSpacePadPortrait; 
    } else if ([DTDevice isPadLandscape]) { 
     self.calendarCellWidth = CalendarItemWidthPadLandscape; 
     self.calendarCellSpace = CalendarItemSpacePadLandscape; 
    } 
    [self.calendarHeader.previousMonthButton removeTarget:self action:@selector(previousMonth) forControlEvents:UIControlEventTouchUpInside]; 
    [self.calendarHeader.previousMonthButton addTarget:self action:@selector(previousMonth) forControlEvents:UIControlEventTouchUpInside]; 
    [self.calendarHeader.nextMonthButton removeTarget:self action:@selector(nextMonth) forControlEvents:UIControlEventTouchUpInside]; 
    [self.calendarHeader.nextMonthButton addTarget:self action:@selector(nextMonth) forControlEvents:UIControlEventTouchUpInside]; 
    self.tableView.hidden = NO; 
    self.calendarHeader.hidden = YES; 
    self.collectionView.hidden = YES; 

    if ([DTDataManager sharedInstance].status == DTDataManagerStatusPersistentStoreIsReady) { 
     [self initDatas]; 
    } 
} 

- (void)viewDidAppear:(BOOL)animated { 
    [super viewDidAppear:animated]; 

    CGFloat width = CGRectGetWidth(self.view.frame); 
    CGFloat burnCircleSpace = (width - CGRectGetWidth(self.burnCircleView.frame) * 3)/4; 
    self.burnCircleLeading.constant = burnCircleSpace; 
    self.burnCircleTrailing.constant = burnCircleSpace; 
    [self.calendarHeader reloadWithWidth:width weekdayWidth:self.calendarCellWidth weekdaySpace:self.calendarCellSpace]; 

    if ([DTUserDefaults getAge] == 0) { 
     [self performSegueWithIdentifier:@"LogToWelcome" sender:self]; 
    } 
} 

- (void)viewDidLayoutSubviews { 
    [super viewDidLayoutSubviews]; 

    if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) { 
     [self.tableView setSeparatorInset:UIEdgeInsetsZero]; 
    } 

    if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) { 
     [self.tableView setLayoutMargins:UIEdgeInsetsZero]; 
    } 
} 

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { 
    if (UIDeviceOrientationIsPortrait(toInterfaceOrientation)) { 
     self.calendarCellWidth = CalendarItemWidthPadPortrait; 
     self.calendarCellSpace = CalendarItemSpacePadPortrait; 
    } else { 
     self.calendarCellWidth = CalendarItemWidthPadLandscape; 
     self.calendarCellSpace = CalendarItemSpacePadLandscape; 
    } 
    CGFloat width = CGRectGetWidth(self.view.frame); 
    CGFloat burnCircleSpace = (width - CGRectGetWidth(self.burnCircleView.frame) * 3)/4; 
    self.burnCircleLeading.constant = burnCircleSpace; 
    self.burnCircleTrailing.constant = burnCircleSpace; 
    [self.calendarHeader reloadWithWidth:width weekdayWidth:self.calendarCellWidth weekdaySpace:self.calendarCellSpace]; 
    [self.collectionView reloadData]; 

    self.blankView.frame = CGRectMake(0, self.topLayoutGuide.length, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame) - self.topLayoutGuide.length - self.bottomLayoutGuide.length); 
} 

#pragma mark - Collection View Data Source and Delegate 

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { 
    NSDate *firstDayOfMonth = [self.date firstDayOfMonth]; 
    NSInteger offset = [firstDayOfMonth weekday] - 1; 
    NSInteger numberOfDaysInMonth = [firstDayOfMonth numberOfDaysInMonth]; 
    return offset + numberOfDaysInMonth; 
} 

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { 
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:DTCalendarCellIdentifier forIndexPath:indexPath]; 
    NSDate *firstDayOfMonth = [self.date firstDayOfMonth]; 
    NSInteger offset = [firstDayOfMonth weekday] - 1; 
    if (indexPath.row < offset) { 
     cell.hidden = YES; 
    } else { 
     cell.hidden = NO; 
     NSInteger day = indexPath.row + 1 - offset; 
     NSCalendar *calendar = [NSCalendar currentCalendar]; 
     NSDateComponents *dayOfMonthComponents = [calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:firstDayOfMonth]; 
     [dayOfMonthComponents setDay:day]; 
     NSDate *dayOfMonth = [calendar dateFromComponents:dayOfMonthComponents]; 
     UILabel *label = cell.contentView.subviews[0]; 
     UIImageView *imageView = cell.contentView.subviews[1]; 
     UIColor *labelTextColor; 
     UIColor *cellBackgroundColor; 
     if ([dayOfMonth sameDay:self.date]) { 
      labelTextColor = [UIColor whiteColor]; 
      cellBackgroundColor = [DTTheme calendarCurrentDateColor]; 
     } else if ([dayOfMonth sameDay:[NSDate new]]) { 
      labelTextColor = [UIColor whiteColor]; 
      cellBackgroundColor = [DTTheme orangeColor]; 
     } else { 
      labelTextColor = [DTTheme darkGrayColor]; 
      cellBackgroundColor = [DTTheme calendarDefaultDateColor]; 
     } 
     label.textColor = labelTextColor; 
     cell.backgroundColor = cellBackgroundColor; 
     label.text = [dayOfMonth formatDate:@"d"]; 
     if ([[DTDataManager sharedInstance] existedLogsWithDate:[dayOfMonth formatDayOfYear]]) { 
      imageView.hidden = NO; 
      imageView.tintColor = labelTextColor; 
      imageView.image = [[UIImage imageNamed:@"circle-full"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]; 
     } else { 
      imageView.hidden = YES; 
     } 
    } 
    return cell; 
} 

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { 
    return CGSizeMake(self.calendarCellWidth, self.calendarCellWidth); 
} 

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section { 
    return self.calendarCellSpace; 
} 

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section { 
    return self.calendarCellSpace; 
} 

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { 
    CGFloat padding = (CGRectGetWidth(self.view.frame) - self.calendarCellWidth * 7 - self.calendarCellSpace * 6)/2; 
    return UIEdgeInsetsMake(0, padding, padding, padding); 
} 

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { 
    NSDate *firstDayOfMonth = [self.date firstDayOfMonth]; 
    NSInteger offset = [firstDayOfMonth weekday] - 1; 
    if (indexPath.row >= offset) { 
     NSInteger day = indexPath.row + 1 - offset; 
     NSCalendar *calendar = [NSCalendar currentCalendar]; 
     NSDateComponents *dayOfMonthComponents = [calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:firstDayOfMonth]; 
     [dayOfMonthComponents setDay:day]; 
     self.date = [calendar dateFromComponents:dayOfMonthComponents]; 
     [self initDatas]; 
    } 
} 

#pragma mark - Table View Data Source and Delegate 

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath { 
    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) { 
     [cell setSeparatorInset:UIEdgeInsetsZero]; 
    } 

    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) { 
     [cell setLayoutMargins:UIEdgeInsetsZero]; 
    } 
} 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return self.brands.count; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
    NSArray *logs = self.brands[section]; 
    return logs.count; 
} 

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section { 
    DTLogHeader *header = [tableView dequeueReusableHeaderFooterViewWithIdentifier:DTLogHeaderIdentifier]; 
    NSArray *logs = self.brands[section]; 
    DTLog *log = logs.firstObject; 
    if ([log isNoBrand]) { 
     header.contentTitleLabel.text = NSLocalizedString(@"NoBrand", @"No Brand Text"); 
    } else { 
     header.contentTitleLabel.text = log.brand; 
    } 
    return header; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
    DTLogCell *cell = [tableView dequeueReusableCellWithIdentifier:DTLogCellIdentifier]; 
    NSArray *logs = self.brands[indexPath.section]; 
    DTLog *log = logs[indexPath.row]; 
    UIColor *color = log.isFood ? [DTTheme orangeColor] : [DTTheme greenColor]; 
    NSString *modifier = log.isFood ? @"+" : @"-"; 
    int calorie = [DTUserDefaults isUnitStandard] ? log.calorieStandard : log.calorieMetric; 
    ((DTRectangleView *)cell.contentRectangleView).color = color; 
    cell.contentNameLabel.text = log.name; 
    cell.contentUnitLabel.text = log.unit; 
    cell.contentCalorieLabel.text = [NSString stringWithFormat:@"%@ %d %@", modifier, calorie, [DTUserDefaults calorieUnit]]; 
    cell.contentCalorieLabel.textColor = color; 
    return cell; 
} 

- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath { 
    return UITableViewCellEditingStyleDelete; 
} 

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { 
    if (editingStyle == UITableViewCellEditingStyleDelete) { 
     NSArray *logs = self.brands[indexPath.section]; 
     DTLog *log = logs[indexPath.row]; 
     [[DTDataManager sharedInstance] removeLog:log]; 
    } 
} 

#pragma mark - Actions 

- (void)calendar { 
    if (self.tableView.hidden) { 
     self.tableView.hidden = NO; 
     self.calendarHeader.hidden = YES; 
     self.collectionView.hidden = YES; 
    } else { 
     self.tableView.hidden = YES; 
     self.calendarHeader.hidden = NO; 
     self.collectionView.hidden = NO; 
    } 
} 

- (void)today { 
    self.date = [NSDate new]; 
    [self initDatas]; 
} 

- (void)yesterday { 
    self.date = [self.date yesterday]; 
    [self initDatas]; 
} 

- (void)tomorrow { 
    self.date = [self.date tomorrow]; 
    [self initDatas]; 
} 

- (void)previousMonth { 
    self.date = [self.date previousMonth]; 
    [self initDatas]; 
} 

- (void)nextMonth { 
    self.date = [self.date nextMonth]; 
    [self initDatas]; 
} 

#pragma mark - ManagedObjectContextObserverDelegate 

- (void)contextObserverDidInsert { 
    [self initDatas]; 
} 

- (void)contextObserverDidDelete { 
    [self initDatas]; 
} 

#pragma mark - Private Helper Method 

- (void)initDatas { 
    NSString *date = [self.date formatDayOfYear]; 
    NSMutableArray *brands = [NSMutableArray new]; 
    NSArray *logObjects = [[DTDataManager sharedInstance] findLogsWithDate:date]; 
    DTLog *lastLog; 
    NSMutableArray *logs; 
    for (NSManagedObject *logObject in logObjects) { 
     DTLog *log = [[DTLog alloc] initWithManagedObject:logObject]; 
     if (!lastLog || ![lastLog.brand isEqual:log.brand]) { 
      logs = [NSMutableArray new]; 
      [brands addObject:logs]; 
      lastLog = log; 
     } 
     [logs addObject:log]; 
    } 
    self.brands = brands; 
    [self reloadView]; 
    if (self.observer) { 
     [[DTDataManager sharedInstance] resetLogContextObserver:self.observer date:date]; 
    } else { 
     self.observer = [[DTDataManager sharedInstance] logContextObserverWithDate:date]; 
     self.observer.delegate = self; 
    } 
} 

- (void)reloadView { 
    [self reloadTotal]; 
    [self.tableView reloadData]; 
    self.calendarHeader.monthLabel.text = [self.date localMonth]; 
    [self.collectionView reloadData]; 
} 

- (void)reloadTotal { 
    NSString *calorieUnit = [DTUserDefaults calorieUnit]; 
    int recommend = [DTUnitConverter dailyIntake]; 
    int intake = 0; 
    int burn = 0; 
    for (NSArray *logs in self.brands) { 
     for (DTLog *log in logs) { 
      int calorie = [DTUserDefaults isUnitStandard] ? log.calorieStandard : log.calorieMetric; 
      if (log.isFood) { 
       intake += calorie; 
      } else { 
       burn += calorie; 
      } 
     } 
    } 
    int neat = intake - burn; 
    int suggestion = recommend - neat; 
    NSString *imageName = @"utensils-full"; 
    NSString *modifier = @""; 
    if (suggestion > 0) { 
     modifier = @"+"; 
    } else if (suggestion < 0) { 
     imageName = @"weights-full"; 
    } 
    CGFloat percent = neat * 1.0/recommend; 
    if (percent > 1.0) { 
     percent = 1.0; 
    } 
    self.intakeLabel.text = [NSString stringWithFormat:@"%d", intake]; 
    self.burnLabel.text = [NSString stringWithFormat:@"%d", burn]; 
    self.netLabel.text = [NSString stringWithFormat:@"%d", neat]; 
    self.intakeUnit.text = calorieUnit; 
    self.burnUnit.text = calorieUnit; 
    self.netUnit.text = calorieUnit; 
    self.dayLabel.text = [NSString stringWithFormat:@"%@ %@", [self.date localDate], [self.date localWeekday]]; 
    self.budgetImageView.image = [UIImage imageNamed:imageName]; 
    self.budgetLabel.text = [NSString stringWithFormat:@"%@%d %@", modifier, suggestion, calorieUnit]; 
    self.recommendLabel.text = [NSString stringWithFormat:@"%d %@", recommend, calorieUnit]; 
    self.percentView.percent = percent; 
} 

- (void)userDefaultsChanged { 
    [self reloadView]; 
} 

- (void)significantTimeChanged { 
    NSCalendar *calendar = [NSCalendar currentCalendar]; 
    NSDate *currentTime = [NSDate new]; 
    NSDate *significantTime = [DTUserDefaults getSignificantTime]; 
    if (significantTime) { 
     NSDateComponents *currentTimeComponents = [calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) 
               fromDate:currentTime]; 
     NSDateComponents *significantTimeComponents = [calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) 
                   fromDate:significantTime]; 
     if (significantTimeComponents.day != currentTimeComponents.day 
      || significantTimeComponents.month != currentTimeComponents.month 
      || significantTimeComponents.year != currentTimeComponents.year) { 
      self.date = [NSDate new]; 
      [self initDatas]; 
      [DTUserDefaults setSignificantTime:currentTime]; 
     } 
    } else { 
     self.date = [NSDate new]; 
     [self initDatas]; 
     [DTUserDefaults setSignificantTime:currentTime]; 
    } 
} 

@end

来源

2015-02-06 Dan Jiang

这个问题没有足够的信息。没有任何问题的截图或背景。 – 2015-02-06 02:07:07

你应该更多地写下这个视图控制器中发生的事情。 – 2015-02-06 02:09:08

我没有足够的声望发布图片。这是一个[截图链接]（http://segmentfault.com/img/bVkOUY/view）。每次用户更改日期以查看当天的总卡路里。它会在核心数据中找到数据，然后调用reloadTotal来更新视图。所以budgetLabel渲染两次。 – 2015-02-06 02:43:05

一个问题可能是您不断重新加载标签。

相反试试这个：

if (!self.budgetLabel) { 

    // Put in here the code you are using to allocate your label 
    self.budgetLabel = [[UILabel alloc] init]; 

    // ... 

    // Code to set up the label 
}

然后把标签设置文本

self.budgetLabel.text = [NSString stringWithFormat:@"%@%d %@", modifier, suggestion, calorieUnit];

更改标签的文本不应该重新加载或添加标签。如果你有这个问题，那么它可能意味着你不断地添加标签，或者至少一次又一次地分配标签。

这个问题很难理解，所以如果您可以使问题更清楚，那么我们就可以更轻松地排除故障。

来源

2015-02-06 02:49:21

我从不在代码中创建标签。 – 2015-02-06 02:57:56

通过渲染两次，你的意思是什么？ – 2015-02-06 03:06:44

首先标签显示“5678 Cal”。用户选择另一天之后。标签在同一个地方显示“7896 Cal”。但是“5678 Cal”并没有消失。 – 2015-02-06 03:56:11

iOS IBOutlet UILabel Duplicate

回答

相关问题