沒有得到正確的UILabel歸因文本正確

Question

我有一個uilabel到我的iOS應用程序。我使用段落樣式將歸因文本應用於UIlabel。但我沒有理解爲什麼理由不適用於第4-5行？然後開始所有打印（見下面的截圖）。請建議我做錯了什麼。

問題

MY CODE - DetailsViewController.m

#import "DetailsViewController.h" 

@interface DetailsViewController() 

@property (weak, nonatomic) IBOutlet UILabel *labelDescription; 
@property (weak, nonatomic) IBOutlet UILabel *labelDetails; 
@property (strong, nonatomic) NSMutableParagraphStyle *paragraphStyle; 

@end 

@implementation DetailsViewController 

#pragma mark - lazy instantiation 

- (NSMutableParagraphStyle *)paragraphStyle { 
    if (!_paragraphStyle) { 
     _paragraphStyle = [[NSMutableParagraphStyle alloc] init]; 
     [_paragraphStyle setAlignment:NSTextAlignmentJustified]; 
     [_paragraphStyle setHyphenationFactor:1.0f]; 
     [_paragraphStyle setLineSpacing:5.0f]; 
    } 
    return _paragraphStyle; 
} 

#pragma mark - view controllers life cycle methods 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    [self.view layoutIfNeeded]; 

    // updating fonts 
    [Utils updateLabelFontSize:self.labelDescription ForInitialHeight:20 andInitialSize:18]; 
    [self.labelDetails setFont:[self.labelDetails.font fontWithSize:[self.labelDescription bounds].size.height * 0.85]]; 

    // create labelText to.hFile 
    NSString *labelText = @"Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum."; 
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText]; 

    [attributedString addAttribute:NSParagraphStyleAttributeName value:self.paragraphStyle range:NSMakeRange(0, [labelText length])]; 
    [self.labelDetails setAttributedText:attributedString]; 
} 

@end 

Answer 1

嘗試此代碼：

NSMutableParagraphStyle *ParagraphStyle = [[NSMutableParagraphStyle alloc] init]; 
    ParagraphStyle.alignment = NSTextAlignmentJustified; 
    ParagraphStyle.firstLineHeadIndent = 0.001; 
    ParagraphStyle.lineSpacing = 5.0; 
    NSAttributedString *attStr = [[NSAttributedString alloc] initWithString:labeltext attributes:@{NSParagraphStyleAttributeName:ParagraphStyle}]; 
self.labelDetails.AttributedText = attStr;