如何用UITabel 展示
// 添加行间距
NSMutableParagraphStyle * paragraph = [[NSMutableParagraphStyle alloc]init];
paragraph.lineSpacing = 2.0;
// 字体: 大小 颜色 行间距
NSAttributedString * attributedStr = [[NSAttributedString alloc]initWithString:instr attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:17],NSForegroundColorAttributeName:SystemContentColor,NSParagraphStyleAttributeName:paragraph}];
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