iOS UITextView相关

1.UITextView默认文字四周会有8 point的padding。

2.改变行间距的方法：使用富文本。具体代码：

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle
alloc]
init];

paragraphStyle.lineSpacing =8;

NSDictionary *attributes =
@{NSFontAttributeName:[UIFont
systemFontOfSize:10],
NSParagraphStyleAttributeName:paragraphStyle};

self.contentTextView.attributedText = [[NSAttributedString
alloc] initWithString:contentString
attributes:attributes];