在我的项目中，我放置了一个UIWebViewunderUINavigationBar和 setupUIWebView以占据屏幕的其余部分，而不是UINavigationBar. 但我发现这两个控件之间存在一些差距。UIWebView左侧边缘和左侧之间也有间隙。知道我缺少什么吗？
这是我更新的代码： in UIView+AutoLayout: (这个类别将所有视图的translatesAutoresizingMaskIntoConstraints属性设置为NO)
#import "UIView+AutoLayout.h"
@implementation UIView (AutoLayout)
+ (id)autolayoutView
{
UIView *view = [self new];
view.translatesAutoresizingMaskIntoConstraints = NO;
return view;
}
@end
在视图控制器中：
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationBar = [UINavigationBar autolayoutView];
UINavigationItem *backToListItem = [[UINavigationItem alloc] init];
UIBarButtonItem *listItem = [[UIBarButtonItem alloc] initWithTitle:@"List" style:UIBarButtonItemStylePlain target:self action:@selector(listButtonPressed:)];
backToListItem.leftBarButtonItem = listItem;
self.navigationBar.items = [NSArray arrayWithObject:backToListItem];
[self.view addSubview:self.navigationBar];
self.webView = [TNSWebView autolayoutView];
[self.view addSubview:self.webView];
NSDictionary *views = NSDictionaryOfVariableBindings(_navigationBar, _webView);
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"|[_navigationBar]|"
options:0 metrics:nil
views:views]];
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"V:|[_navigationBar]->=0-[_webView]|"
options:0 metrics:nil
views:views]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_webView]|" options:0 metrics:nil views:views]];
[self.webView setupVideoPlayer:self.videoId];
}
使用中的po [[UIWindow keyWindow] recursiveDescription]命令lldb我得到了这个结果
| <UIView: 0x1d23f880; frame = (0 20; 768 1004); autoresize = RM+BM; layer = <CALayer: 0x1d23cba0>>
| | <UINavigationBar: 0x1d00a4b0; frame = (0 0; 768 44); gestureRecognizers = <NSArray: 0x1d015ff0>; layer = <CALayer: 0x1d0c8f60>>
| | | <_UINavigationBarBackground: 0x1d010250; frame = (0 0; 768 44); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d011140>>
| | | | <UIImageView: 0x1d0d26b0; frame = (0 44; 768 3); opaque = NO; autoresize = W+TM; userInteractionEnabled = NO; layer = <CALayer: 0x1d23fbd0>>
| | | <UINavigationItemView: 0x1d016740; frame = (384 22; 0 0); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d016840>>
| | | <UINavigationButton: 0x1d013ff0; frame = (7 7; 48 30); opaque = NO; layer = <CALayer: 0x1d014170>>
| | | | <UIImageView: 0x1c5d9ca0; frame = (0 0; 48 30); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1c58b330>>
| | | | <UIButtonLabel: 0x1d0144c0; frame = (13 7; 22 15); text = 'List'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d014560>>
| | <TNSWebView: 0x1d016bc0; baseClass = UIWebView; frame = (0 44; 768 960); layer = <CALayer: 0x1d016ca0>>
| | | <_UIWebViewScrollView: 0x1d012390; frame = (0 0; 768 960); clipsToBounds = YES; autoresize = H; gestureRecognizers = <NSArray: 0x1d011380>; layer = <CALayer: 0x1d0125e0>; contentOffset: {0, 0}>
| | | | <UIImageView: 0x1d00f2a0; frame = (0 0; 10 10); transform = [-1, 0, -0, -1, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00f300>>
| | | | <UIImageView: 0x1d00f210; frame = (0 0; 10 10); transform = [0, 1, -1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00f270>>
| | | | <UIImageView: 0x1d00f180; frame = (0 0; 10 10); transform = [0, -1, 1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00f1e0>>
| | | | <UIImageView: 0x1d00efb0; frame = (0 0; 10 10); alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00f150>>
| | | | <UIImageView: 0x1d00ef20; frame = (-4.5 4.5; 10 1); transform = [0, 1, -1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00ef80>>
| | | | <UIImageView: 0x1d00ee90; frame = (-4.5 4.5; 10 1); transform = [0, -1, 1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00eef0>>
| | | | <UIImageView: 0x1d00ee00; frame = (0 0; 1 10); transform = [-1, 0, -0, -1, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00ee60>>
| | | | <UIImageView: 0x1d00ec30; frame = (0 0; 1 10); alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00edd0>>
| | | | <UIImageView: 0x1d00eba0; frame = (0 954; 768 6); alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00ec00>>
| | | | <UIImageView: 0x1d00fcd0; frame = (0 0; 768 6); transform = [-1, 0, -0, -1, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1d00fe70>>
| | | | <UIWebBrowserView: 0x1dbf2400; frame = (0 0; 768 960); gestureRecognizers = <NSArray: 0x1d014c40>; layer = <UIWebLayer: 0x1d017d00>>
| | | | | <TileHostLayer: 0x1d017e70> (layer)
| | | | | | <TileLayer: 0x1c5511a0> (layer)
| | | | | | <TileLayer: 0x1c551210> (layer)
| | | | | | <TileLayer: 0x1c551250> (layer)
| | | | | | <TileLayer: 0x1c551290> (layer)
更新后的截图：
通过将导航栏的高度更改为 44 并使用 recursiveDescription 命令，我得到：
$0 = 0x2008f680 <UIWindow: 0x1ed814f0; frame = (0 0; 768 1024); autoresize = W+H; layer = <UIWindowLayer: 0x1ed815f0>>
| <UIView: 0x20167680; frame = (0 20; 768 1004); autoresize = RM+BM; layer = <CALayer: 0x1ed0ea50>>
| | <UINavigationBar: 0x1ed14b70; frame = (0 0; 768 44); gestureRecognizers = <NSArray: 0x20081bd0>; layer = <CALayer: 0x1ed09ff0>>
| | | <_UINavigationBarBackground: 0x1ed8b9b0; frame = (0 0; 768 44); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1ed08570>>
| | | | <UIImageView: 0x2007aa90; frame = (0 44; 768 3); opaque = NO; autoresize = W+TM; userInteractionEnabled = NO; layer = <CALayer: 0x200f9640>>
| | | <UINavigationItemView: 0x20053320; frame = (384 22; 0 0); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200f9c30>>
| | | <UINavigationButton: 0x200fa980; frame = (7 7; 48 30); opaque = NO; layer = <CALayer: 0x200f50c0>>
| | | | <UIImageView: 0x2016af20; frame = (0 0; 48 30); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x2016af80>>
| | | | <UIButtonLabel: 0x2004e420; frame = (13 7; 22 15); text = 'List'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200f8040>>
| | <TNSWebView: 0x2004d660; baseClass = UIWebView; frame = (0 44; 768 960); layer = <CALayer: 0x20053f20>>
| | | <_UIWebViewScrollView: 0x2004a230; frame = (0 0; 768 960); clipsToBounds = YES; autoresize = H; gestureRecognizers = <NSArray: 0x20049700>; layer = <CALayer: 0x2004a6c0>; contentOffset: {0, 0}>
| | | | <UIImageView: 0x20048d50; frame = (0 0; 10 10); transform = [-1, 0, -0, -1, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x20048db0>>
| | | | <UIImageView: 0x20048cc0; frame = (0 0; 10 10); transform = [0, 1, -1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x20048d20>>
| | | | <UIImageView: 0x20048c30; frame = (0 0; 10 10); transform = [0, -1, 1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x20048c90>>
| | | | <UIImageView: 0x200f7c50; frame = (0 0; 10 10); alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x20048c00>>
| | | | <UIImageView: 0x200f7bc0; frame = (-4.5 4.5; 10 1); transform = [0, 1, -1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200f7c20>>
| | | | <UIImageView: 0x200f7b30; frame = (-4.5 4.5; 10 1); transform = [0, -1, 1, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200f7b90>>
| | | | <UIImageView: 0x200f7a30; frame = (0 0; 1 10); transform = [-1, 0, -0, -1, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200f7b00>>
| | | | <UIImageView: 0x200f7890; frame = (0 0; 1 10); alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200f7a00>>
| | | | <UIImageView: 0x200fad20; frame = (0 954; 768 6); alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200fad80>>
| | | | <UIImageView: 0x200fab80; frame = (0 0; 768 6); transform = [-1, 0, -0, -1, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x200facf0>>
| | | | <UIWebBrowserView: 0x1fb37600; frame = (0 0; 768 960); gestureRecognizers = <NSArray: 0x20049910>; layer = <UIWebLayer: 0x200f81c0>>
| | | | | <TileHostLayer: 0x2004ed10> (layer)
| | | | | | <TileLayer: 0x20168820> (layer)
| | | | | | <TileLayer: 0x20168890> (layer)
| | | | | | <TileLayer: 0x201688d0> (layer)
| | | | | | <TileLayer: 0x20168910> (layer)