NSAttributedString z załącznikiem obrazu i tekstem NSTextTab, tekst nie jest wyrównany

Question

Próbuję mieć UIlabel z obrazem i tytułem po lewej stronie oraz listę opisów z punktorami po prawej, aby to zrobić Używam NSAttributedString w ten sposób :

 NSMutableParagraphStyle *pStyle = [[NSMutableParagraphStyle alloc] init]; 
    pStyle.tabStops = 
     @[ [[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:tabLocation options:[NSDictionary dictionary]] ]; 

    NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] init]; 
    NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init]; 
    textAttachment.image = [UIImage imageNamed:@"test_image"]; 
    textAttachment.bounds = CGRectMake(0, -3, 15, 15);//resize the image 
    attString = [NSAttributedString attributedStringWithAttachment:textAttachment].mutableCopy; 
    [attString appendAttributedString:[[NSAttributedString alloc] 
              initWithString:[NSString stringWithFormat:@"title\t\u2022 %@", 
                        [@[ @"description1", @"description2" ] 
                         componentsJoinedByString:@"\n\t\u2022 "]] 
               attributes:@{NSParagraphStyleAttributeName : pStyle}]]; 
    label.attributedText = attString; 

Spodziewam listy po prawej stronie, aby być wyrównany do lewej, ale to nie jest przypadek, tutaj jest wynikiem uzyskać:

Czego oczekuję lista zostać dostosowane w ten sposób:

Answer 1

Problem jest z location parametru w NSTextTab

• Zgodnie z opisem, parametr pomaga ustawić tekst z lewego marginesu. Więc to jest to, co potrzebne, wystarczy zastąpić poniżej linii

  pStyle.tabStops = @[ [[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:tabLocation options:[NSDictionary dictionary]] ]; 
  

  z

  pStyle.tabStops = @[[[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:[self getTextLocationFor:@"test"] options:[NSDictionary dictionary]] ]; 
  

• Dodaj getTextLocationFor: metodę do obliczania położenia następująco

  -(CGFloat)getTextLocationFor:(NSString *)inputStr{ 
      CGSize maximuminputStringWidth = CGSizeMake(FLT_MAX, 30); 
      CGRect textRect = [inputStr boundingRectWithSize:maximuminputStringWidth 
               options:NSStringDrawingUsesLineFragmentOrigin 
              attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:15]} 
               context:nil]; 
      UIImageView * testImage = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"close_red"]];//Change image name with yours 
  
      return textRect.size.width + testImage.frame.size.width +2; 
  } 
  

• To wszystko jesteśmy gotowi, aby przejść uruchom swój projekt, teraz wszystko będzie dobrze.

WYNIK:

Answer 2

jeśli rozumiem poprawnie spróbuj te kod:

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 460, 460)]; 
label.numberOfLines = 0; 
[self.view addSubview:label]; 

NSMutableParagraphStyle *pStyle = [[NSMutableParagraphStyle alloc] init]; 
pStyle.tabStops = @[ [[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:40 options:@{}] ]; 

NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init]; 
textAttachment.image = [UIImage imageNamed:@"img"]; 
textAttachment.bounds = CGRectMake(0, -3, 30, 30); 


NSString *string = [NSString stringWithFormat:@"title\n\r\u2022 %@", [@[ @"description1", @"description2" ] componentsJoinedByString:@"\n\r\u2022 "]]; 

NSMutableAttributedString *attributedString = [[NSMutableAttributedString attributedStringWithAttachment:textAttachment] mutableCopy]; 
[attributedString appendAttributedString:[[NSMutableAttributedString alloc] initWithString:string attributes:@{NSParagraphStyleAttributeName : pStyle}]]; 

label.attributedText = attributedString; 

Oto wynik

UPDATE

można jedynie osiągnąć to za pomocą TextKit (NSTextLayoutManager) i określ obszar, który powinien być użyty do narysowania tekst lub użyj prostego rozwiązania i podklasy z UIView.

Oto rozwiązanie ze względu

ListView.h

@interface ListView : UIView 

@property(nonatomic,strong) UIImage *image; 
@property(nonatomic,strong) NSString *title; 
@property(nonatomic,strong) NSArray *list; 

@end 

ListView.m

static const CGFloat ImageWidth = 13.f; 

@interface ListView() 
@property (nonatomic,weak) UIImageView *imageView; 
@property (nonatomic,weak) UILabel *titleLabel; 
@property (nonatomic,weak) UILabel *listLabel; 
@end 

@implementation ListView 
- (instancetype)initWithFrame:(CGRect)frame { 
    self = [super initWithFrame:frame]; 
    [self setup]; 
    return self; 
} 

- (instancetype)initWithCoder:(NSCoder *)aDecoder { 
    self = [super initWithCoder:aDecoder]; 
    [self setup]; 
    return self; 
} 

- (void)awakeFromNib { 
    [super awakeFromNib]; 
    [self setup]; 
} 

- (void)setup { 
    UIImageView *imageView = [[UIImageView alloc] init]; 
    imageView.translatesAutoresizingMaskIntoConstraints = NO; 
    [self addSubview:imageView]; 
    self.imageView = imageView; 

    UILabel *titleLabel = [[UILabel alloc] init]; 
    titleLabel.translatesAutoresizingMaskIntoConstraints = NO; 
    titleLabel.numberOfLines = 0; 
    [titleLabel setContentCompressionResistancePriority:UILayoutPriorityDefaultHigh forAxis:UILayoutConstraintAxisHorizontal]; 
    [titleLabel setContentHuggingPriority:UILayoutPriorityDefaultHigh forAxis:UILayoutConstraintAxisHorizontal]; 
    [self addSubview:titleLabel]; 
    self.titleLabel = titleLabel; 

    UILabel *listLabel = [[UILabel alloc] init]; 
    listLabel.translatesAutoresizingMaskIntoConstraints = NO; 
    listLabel.numberOfLines = 0; 
    [listLabel setContentCompressionResistancePriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal]; 
    [listLabel setContentHuggingPriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal]; 
    [self addSubview:listLabel]; 
    self.listLabel = listLabel; 

    NSDictionary *views = NSDictionaryOfVariableBindings(imageView,titleLabel,listLabel); 
    NSDictionary *metrics = @{ @"ImageHeight" : @(ImageWidth) }; 

    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[imageView(ImageHeight)]-0-[titleLabel]-0-[listLabel]-0-|" options:0 metrics:metrics views:views]]; 
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[imageView(ImageHeight)]" options:NSLayoutFormatAlignAllTop metrics:metrics views:views]]; 
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[titleLabel]" options:NSLayoutFormatAlignAllTop metrics:metrics views:views]]; 
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[listLabel]-0-|" options:NSLayoutFormatAlignAllTop metrics:metrics views:views]]; 
} 

- (void)setImage:(UIImage *)image { 
    _image = image; 
    self.imageView.image = image; 
    [self setNeedsLayout]; 
} 

- (void)setTitle:(NSString *)title { 
    _title = title; 
    self.titleLabel.text = title; 
    [self setNeedsLayout]; 
} 

- (void)setList:(NSArray *)list { 
    _list = list; 

    NSMutableParagraphStyle *pStyle = [[NSMutableParagraphStyle alloc] init]; 
    pStyle.tabStops = @[ [[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:40 options:@{}] ]; 

    NSString *string = [NSString stringWithFormat:@"\u2022 %@", [list componentsJoinedByString:@"\n\u2022 "]]; 
    self.listLabel.attributedText = [[NSAttributedString alloc] initWithString:string attributes:@{NSParagraphStyleAttributeName : pStyle}]; 

    [self setNeedsLayout]; 
} 

@end