UITabBarController的item间距能不能设置
UITabBarController的每个item不设title的话，那个title还是会占据着最下面那一行的位置，该怎么去隐藏它让那个位置空出来
可以换一种方案，调整UIBarItem的imageInsets使图片居中 （我假设你真正想要的是让图片居中显示）
<code style="font-family: 'Source Code Pro', Consolas, Menlo, Monaco, 'Courier New', monospace; font-size: 1em; color: inherit; padding: 0px; white-space: inherit; background: none;"><span class="hljs-title" style="color: rgb(38, 139, 210);">[self.tabBarItem setImageInsets:UIEdgeInsetsMake(10, 0, -10, 0)]</span><span class="hljs-comment" style="color: rgb(147, 161, 161);">;</span>
</code>
UIEdgeInsetsMake的top和bottom属性为相反数，
否则会发生点击item后拖动，item会发生形变。
1. //
2. // RootViewController.m
3. // test_storyBoard_ipad
4. //
5. // Created by admin on 3/4/16.
6. // Copyright © 2016 jeffasd. All rights reserved.
7. //
8.
9. #import "RootViewController.h" //父类 UITabbarController
10.
11. @interface RootViewController ()
12.
13. @end
14.
15. @implementation RootViewController
16.
17. - (void)viewDidLoad {
18. super viewDidLoad];
19.
20.
21. // [self.tabBarItem setImageInsets:UIEdgeInsetsMake(10, 0, -10, 0)];
22.
23. // [self.tabBarItem setImageInsets:UIEdgeInsetsMake(30, 0, -30, 0)];
24.
25. // self.tabBar.items
26.
27. for (UITabBarItem *item in self.tabBar.items) {
28.
29. // UIEdgeInsets insets = {top, left, bottom, right};
30.
31. // [item setImageInsets:UIEdgeInsetsMake(10, 0, -10, 0)];
32.
33. // [item setImageInsets:UIEdgeInsetsMake(0, -30, 0, 30)];
34.
35. setImageInsets:UIEdgeInsetsMake(0, -30, 0, 30)];
36.
37. }
38.
39. // UITabBarButton;
40. // UIButton;
41.
42. UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
43. .bounds = CGRectMake(0, 0, 30, 80);
44. .backgroundColor = [UIColor redColor];
45. .center = CGPointMake(self.tabBar.frame.size.width/2, self.tabBar.frame.size.height/2 - 20);
46.
47. // [self.tabBar setShadowImage:IMG(@"transparent")];
48.
49. // button.center = self.tabBar.center;
50.
51. self.tabBar addSubview:button];
52.
53. @"self tabBar is %@", self.tabBar.subviews);
54.
55. // [self.tabBar.superview addSubview:button];
56.
57. // [[UITabBar appearance] setShadowImage:[[UIImage alloc]init]];
58.
59. // [[UITabBar appearance] setBackgroundImage:[[UIImage alloc]init]];
60.
61. self.tabBar.backgroundImage = [[self class] createImageWithColor:[UIColor cyanColor]];
62. self.tabBar.shadowImage = [UIImage new];
63.
64. }
65.
66. /**
67. * 将UIColor变换为UIImage
68. *
69. **/
70. + (UIImage *)createImageWithColor:(UIColor *)color
71. {
72. 0.0f, 0.0f, 1.0f, 1.0f);
73. .size);
74. CGContextRef context = UIGraphicsGetCurrentContext();
75. CGColor]);
76. CGContextFillRect(context, rect);
77. UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
78. UIGraphicsEndImageContext();
79.
80. return theImage;
81. }
82.
83. - (void)didReceiveMemoryWarning {
84. super didReceiveMemoryWarning];
85. // Dispose of any resources that can be recreated.
86. }
87.
88. /*
89. #pragma mark - Navigation
90.
91. // In a storyboard-based application, you will often want to do a little preparation before navigation
92. - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
93. // Get the new view controller using [segue destinationViewController].
94. // Pass the selected object to the new view controller.
95. }
96. */
97.
98. @end
