//不要忘记将numberolines设置为0

UILabel* locationTitle = [[UILabel alloc] initWithFrame:CGRectMake(5, 30, 230, 40)];
locationTitle.font = [UIFont systemFontOfSize:13.0];
locationTitle.numberOfLines = 0;
locationTitle.text = [NSString stringWithFormat:@"Eaton industries pvt. Ltd \nUK Apr 12"];
[cell addSubview:locationTitle];

在xCode 11, Swift 5的\n工作良好，尝试以下代码:

textlabel.numberOfLines = 0
textlabel.text = "This is line one \n This is line two \n This is line three"

textLabel.text = @"\nAAAAA\nBBBBB\nCCCCC";
textLabel.numberOfLines = 3; \\As you want - AAAAA\nBBBBB\nCCCCC
textLabel.lineBreakMode = UILineBreakModeWordWrap;
NSLog(@"The textLabel text is - %@",textLabel.text);

NSCharacterSet *charSet = NSCharacterSet.newlineCharacterSet;
NSString *formatted = [[unformatted componentsSeparatedByCharactersInSet:charSet] componentsJoinedByString:@"\n"];

你必须在UILabel上设置numberolines属性。默认值是1，如果您将其设置为0，它将删除所有限制。

在接口构建器中，可以使用Ctrl + Enter将/n插入到所需位置。 这种方式可以实现以下情况

aaaaaaaaaa