NSParagraphStyle的段SpacingBefore不起作用

Question

NSParagraphStyle的段落SpacingBefore属性似乎没有任何作用。 我很确定它可以在以前的项目中使用，但是在我的旧代码中看不到与现在所做的任何不同。 这是我的示例代码：

textView.contentInset = UIEdgeInsetsZero;

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.alignment = NSTextAlignmentJustified;
paragraphStyle.firstLineHeadIndent = 22;
paragraphStyle.paragraphSpacingBefore = 120;

NSMutableDictionary *attributes = [NSMutableDictionary new];
[attributes setObject:[UIColor blackColor] forKey:NSForegroundColorAttributeName];
[attributes setObject:[UIColor clearColor] forKey:NSBackgroundColorAttributeName];
[attributes setObject:[UIFont fontWithName:@"Helvetica" size:19] forKey:NSFontAttributeName];
[attributes setObject:paragraphStyle forKey:NSParagraphStyleAttributeName];

textView.attributedText = [[NSMutableAttributedString alloc] initWithString:@"Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda." attributes:attributes];

任何建议将不胜感激。

谢谢。

Answer 1

您是否已将Interface Builder中的UITextView绑定到变量textView？

使用Objective-C文字 。

代码已更新

- (void)viewDidLoad {
    [super viewDidLoad];
    self.textView.backgroundColor = [UIColor grayColor];

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.alignment = NSTextAlignmentJustified;
    paragraphStyle.firstLineHeadIndent = 22;
    paragraphStyle.paragraphSpacingBefore = 120;

    NSDictionary *attributes = @{NSForegroundColorAttributeName:[UIColor blackColor],
                                                NSBackgroundColorAttributeName: [UIColor clearColor],
                                                NSFontAttributeName: [UIFont fontWithName:@"Helvetica" size:13],
                                                NSParagraphStyleAttributeName: paragraphStyle
                                                };

    self.textView.attributedText = [[NSMutableAttributedString alloc] initWithString:@"Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. \n Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda." attributes:attributes];

}

结果：