来自NSParagraphStyle的paragraphSpacingBefore不起作用

Question

NSParagraphStyle的paragraphSpacingBefore属性似乎没有做任何事情。我很确定它在之前的项目中有效，但我在旧代码中看不到我现在正在做的事情。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];

任何建议都将不胜感激。

感谢。

Answer 1

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

使用Objective-C Literals。

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：