046在一个UILabel控件中显示多行文本

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>
2
3 @interface ViewController : UIViewController
4 @property (strong, nonatomic) UILabel *lblMessage;
5
6 @end

ViewController.m

 1 #import "ViewController.h"
 2
 3 @interface ViewController ()
 4 @end
 5
 6 @implementation ViewController
 7
 8 - (void)viewDidLoad {
 9     [super viewDidLoad];
10
11     self.title = @"Mutiline";
12     self.view.backgroundColor = [UIColor blackColor];
13
14     _lblMessage = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 320, 460)];
15     _lblMessage.text = @"点击屏幕设置行数；在一个UILabel控件中显示多行文本";
16     _lblMessage.textColor = [UIColor colorWithRed:0.335 green:0.915 blue:1.000 alpha:1.000];
17     _lblMessage.textAlignment = NSTextAlignmentLeft;
18     _lblMessage.backgroundColor = [UIColor colorWithRed:0.852 green:0.941 blue:1.000 alpha:1.000];
19     _lblMessage.adjustsFontSizeToFitWidth = NO; //默认值为NO
20     _lblMessage.baselineAdjustment = UIBaselineAdjustmentAlignBaselines; //baselineAdjustment属性只在adjustsFontSizeToFitWidth属性值设置为YES时才有效；默认值为UIBaselineAdjustmentAlignBaselines
21     _lblMessage.numberOfLines = 1; //默认值为1；如果要自适应行数就设置值为0
22     [self.view addSubview:_lblMessage];
23 }
24
25 - (void)didReceiveMemoryWarning {
26     [super didReceiveMemoryWarning];
27     // Dispose of any resources that can be recreated.
28 }
29
30 #pragma mark - Private Methods
31 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
32     static int i = 1;
33     NSString *message = @"_lblMessage.numberOfLines = %d;点击屏幕设置行数；在一个UILabel控件中显示多行文本。
34 点击屏幕设置行数；在一个UILabel控件中显示多行文本。
35 点击屏幕设置行数；在一个UILabel控件中显示多行文本。
36 点击屏幕设置行数；在一个UILabel控件中显示多行文本。
37 点击屏幕设置行数；在一个UILabel控件中显示多行文本。";
38     _lblMessage.numberOfLines = (i + 1) % 4;
39     _lblMessage.text = [NSString stringWithFormat:message, _lblMessage.numberOfLines];
40     i++;
41 }
42
43 @end