Objective-C:UIToolBar控件的使用

UIToolBar控件：是经常使用的一个工具条控件，在它里面可以添加很多其他控件,UILabel、UIButton、UIImage、UIBarButtonItem、UITextField等等、、。可以用来对视图view中控件进行自定义的布局。视图布局完成后,可以直接拿来用，不用再用代码去控制控件的坐标和大小,方便而且准确。

一、采用系统默认.xib文件中的UIToolBar制作的增删条(删除和添加图片)

（1）添加有两个标签Label的系统设置的UIToolBar

　　代码如下：需要在代码中为添加的控件人为设置frame具体坐标x,y、大小width,height

 1 #import "ViewController.h"
 2 #define CONTACE_VIEW_HEIGHT 50
 3 @interface ViewController ()
 4 @property (weak, nonatomic) IBOutlet UIToolbar *toolBar;
 5 @property (weak, nonatomic) IBOutlet UIBarButtonItem *barButtonitemDelete;
 6
 7 @end
 8
 9 @implementation ViewController
10 - (IBAction)addContact:(UIBarButtonItem *)sender
11 {
12
13     //让删除按钮有效
14     [self.barButtonitemDelete setEnabled:YES];
15
16     //在subView中已经有了3个控件
17     NSInteger count = self.view.subviews.count - 3;
18     CGRect lastFrame = self.toolBar.frame;
19
20     UIView *contactView = [[UIView alloc]init];
21     CGFloat gapY = 5;
22     CGFloat x = 0;
23     CGFloat y = lastFrame.origin.y + lastFrame.size.height + (CONTACE_VIEW_HEIGHT+gapY) * count;
24     CGFloat w = self.view.frame.size.width;
25
26     contactView.frame = CGRectMake(x,y,w,CONTACE_VIEW_HEIGHT);
27
28
29     //添加头像
30     UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png",arc4random_uniform(9)]];
31     UIImageView *face = [[UIImageView alloc]initWithImage:image];
32     face.frame = CGRectMake(10, 0,50,50);
33     [contactView addSubview:face];
34
35     //添加姓名
36     UILabel *labelName = [[UILabel alloc]init];
37     labelName.text = [NSString stringWithFormat:@"name%d",arc4random_uniform(10)];
38     labelName.frame = CGRectMake(10+image.size.width+50, 0, 100, 50);
39     [contactView addSubview:labelName];
40
41
42     contactView.backgroundColor = [UIColor lightGrayColor];
43
44     [self.view addSubview:contactView];
45 }
46 - (IBAction)deleteContact:(UIBarButtonItem *)sender
47 {
48     //删除视图
49     UIView *lastView = [self.view.subviews lastObject];
50     [lastView removeFromSuperview];
51
52     //如果没有了contactView，设置删除按钮无效
53     if(self.view.subviews.count == 3)
54     {
55         [self.barButtonitemDelete setEnabled:NO];
56     }
57 }
58
59 - (void)viewDidLoad {
60     [super viewDidLoad];
61     //开始时删除设置为无效
62     [self.barButtonitemDelete setEnabled:NO];
63 }
64
65 - (void)didReceiveMemoryWarning {
66     [super didReceiveMemoryWarning];
67     // Dispose of any resources that can be recreated.
68 }

　　二、采用提前自定义布局的.xib文件中的UIToolBar制作的增删条(删除和添加图片)

（2）添加UIImage、UILabel控件后自定义的UIToolBar

　　　　代码如下：不需要在代码中再去设置添加控件的frame,在.xib文件中已经布局好了。

 1 import "ViewController.h"
 2 #define CONTACE_VIEW_HEIGHT 50
 3 @interface ViewController ()
 4 @property (weak, nonatomic) IBOutlet UIToolbar *toolBar;
 5 @property (weak, nonatomic) IBOutlet UIBarButtonItem *barButtonitemDelete;
 6
 7 @end
 8
 9 @implementation ViewController
10 - (IBAction)addContact:(UIBarButtonItem *)sender
11 {
12
13     //让删除按钮有效
14     [self.barButtonitemDelete setEnabled:YES];
15
16     //在subView中已经有了3个控件
17     NSInteger count = self.view.subviews.count - 3;
18     CGRect lastFrame = self.toolBar.frame;
19
20     //加载xib文件
21     NSArray *views = [[NSBundle mainBundle]loadNibNamed:@"contactView" owner:nil options:nil];
22
23     //添加contactView
24     UIView *contactView = [views lastObject];
25
26
27     CGFloat gapY = 5;
28     CGFloat x = 0;
29     CGFloat y = lastFrame.origin.y + lastFrame.size.height + (CONTACE_VIEW_HEIGHT+gapY) * count;
30     CGFloat w = self.view.frame.size.width;
31     contactView.frame = CGRectMake(x,y,w,CONTACE_VIEW_HEIGHT);
32
33
34     //添加头像
35     UIImageView *face = (UIImageView *)[contactView viewWithTag:1];
36     UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png",arc4random_uniform(9)]];
37     [face setImage:image];
38
39
40
41     //添加姓名
42     UILabel *labelName = (UILabel *)[contactView viewWithTag:2];
43     labelName.text = [NSString stringWithFormat:@"name%d",arc4random_uniform(10)];
44
45     [self.view addSubview:contactView];
46 }
47
48 - (IBAction)deleteContact:(UIBarButtonItem *)sender
49 {
50     //删除视图
51     UIView *lastView = [self.view.subviews lastObject];
52     [lastView removeFromSuperview];
53
54     //如果没有了contactView，设置删除按钮无效
55     if(self.view.subviews.count == 3)
56     {
57         [self.barButtonitemDelete setEnabled:NO];
58     }
59 }
60
61 - (void)viewDidLoad {
62     [super viewDidLoad];
63     //开始时删除设置为无效
64     [self.barButtonitemDelete setEnabled:NO];
65 }
66
67 - (void)didReceiveMemoryWarning {
68     [super didReceiveMemoryWarning];
69     // Dispose of any resources that can be recreated.
70 }
71
72 @end