获取UIWebview的高度4种方法

来源：互联网发布：p城堡垒优化助手编辑：程序博客网时间：2024/04/30 07:14

第一：效果的对比

第二、代码区

UIWebView 是IOS开发常用的类。它简单好用，使用它，开发者不用写太多的代码。但是，App开发中，获取webview的高度成为开发者必备的知识。我知道网上也有好多方法。我这里是做一个评价，不是新的东西。如有雷同请包涵。

// ViewController.m

// 获取UIWebview的高度4种方法

// Created by MAC on 16/10/8.

#import "ViewController.h"

#import "testViewController.h"

const NSString * BaseIpString =@"http://testapi.anyitou.com";

@interface ViewController ()<UIWebViewDelegate>{

UIWebView * ReloadWebView;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[superviewDidLoad];

/* 我们要UIWebview的高度只适应*/

CGFloat ScreenWeight = [UIScreenmainScreen].bounds.size.width;

CGFloat ScreenHeight = [UIScreenmainScreen].bounds.size.height;

UIWebView * WebView = [[UIWebViewalloc]initWithFrame:CGRectMake(10,60, ScreenWeight-20,200)];

WebView.delegate =self;

/* 关闭webView的反弹*/

WebView.scrollView.bounces =NO;

ReloadWebView = WebView;

[self.viewaddSubview:WebView];

NSString * WebviewUrl = [NSStringstringWithFormat:@"%@/resources/Indexintroduce",BaseIpString];

NSURLRequest * RequestUrl = [NSURLRequestrequestWithURL:[NSURLURLWithString:WebviewUrl]];

[WebView loadRequest:RequestUrl];

/* 测试按钮*/

UIButton * Button = [UIButtonbuttonWithType:UIButtonTypeCustom];

Button.frame =CGRectMake(10, ScreenHeight-50, ScreenWeight-20,40);

Button.backgroundColor = [UIColormagentaColor];

[Button setTitle:@"刷新"forState:UIControlStateNormal];

[Button addTarget:selfaction:@selector(BunClick)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:Button];

// Do any additional setup after loading the view, typically from a nib.

}

#pragma mark -- btn 的点击事件

-(void)BunClick{

[ReloadWebViewreload];

//testViewController * test = [[testViewController alloc]init];

// [self presentViewController:test animated:YES completion:Nil];

}

#pragma mark ---webview 的代理

-(void)webViewDidStartLoad:(UIWebView *)webView{

/* 网页的开始加载*/

NSLog(@"开始");

}

-(void)webViewDidFinishLoad:(UIWebView *)webView{

/* 网页的加载完成*/

/* 在网页加载完成时，修改网页的高度，来达到适配*/

/* 第一种*/

// [self firstAutoHeight:webView];

/* 第二种*/

// [self secondAutoHeight:webView];

/* 第三种*/

//[self threeAutoHeight:webView];

/* 第四种*/

[selffourAutoHeight:webView];

}

-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{

/* 网页的加载失败*/

}

/* 是否允许网页的加载*/

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{

returnYES;

}

-(void)firstAutoHeight:(UIWebView*)webView{

/* 网页是含有UIScrollview对象，我们通过获取 webView的ScrollvIew的内容的高度来获取webView的高度，同事达到高度适配*/

CGFloat WebViewHeight = [webView.scrollViewcontentSize].height;

/* 获取网页现有的frame*/

CGRect WebViewRect = webView.frame;

/* 改版WebView的高度*/

WebViewRect.size.height = WebViewHeight;

/* 重新设置网页的frame*/

webView.frame = WebViewRect;

}

-(void)secondAutoHeight:(UIWebView*)webView{

/* 让UIWebView的大小先设置为0，然后，使用sizeThatFits获取webview的高度*/

CGSize WebViewSize = [webViewsizeThatFits:CGSizeZero];

/* 获取网页现有的frame*/

CGRect WebViewRect = webView.frame;

/* 设置高度*/

WebViewRect.size.height = WebViewSize.height;

webView.frame = WebViewRect;

或者：

[webView sizeToFit];

CGRect WebViewRect = webView.frame;

webView.frame = WebViewRect;

}

-(void)threeAutoHeight:(UIWebView*)webView{

/* 可取的js:

1、@"document.body.scrollHeight" (为主)

2、@"window.screen.height"要求高度不能超过屏幕高度。

/* 我们使用js来获取网页的高度*/

NSString * JsString =@"document.body.offsetHeight";

CGFloat WebViewHeight = [[webViewstringByEvaluatingJavaScriptFromString:JsString]floatValue];

/* 获取网页现有的frame*/

CGRect WebViewRect = webView.frame;

/* 改版WebView的高度*/

WebViewRect.size.height = WebViewHeight;

/* 重新设置网页的frame*/

webView.frame = WebViewRect;

}

-(void)fourAutoHeight:(UIWebView*)webView{

/* 设置新的高度*/

CGFloat WebViewHeight =0.0;

/* 判断是否有内容存在*/

// NSLog(@"%@",[webView subviews]);

2016-10-08 14:35:19.057 获取UIWebview的高度[2456:1247177] (

"<_UIWebViewScrollView: 0x7ff84383b600; frame = (0 0; 355 200); clipsToBounds = YES; autoresize = H; gestureRecognizers = <NSArray: 0x618000054760>; layer = <CALayer: 0x61800003ff40>; contentOffset: {0, 0}; contentSize: {355, 439}>"

)

if ([webViewsubviews].count >0) {

/* 获取最后一个div*/

UIScrollView * WebViewLastView = [[webViewsubviews] lastObject];

NSLog(@"%@",[WebViewLastViewsubviews]);

输出内容：

2016-10-08 14:36:47.795 获取UIWebview的高度[2473:1255283] (

"<UIWebBrowserView: 0x7fbc8980ee00; frame = (0 0; 355 439); text = ' \n\U56fd\U6709\U80cc\U666f \U5b9e\U529b\U4fdd\U969c\n\U8d85\U5f3a\U6297\U98ce\U9669\U80fd\U529b\n \n\U4e13\U4e1a\U7684...'; gestureRecognizers = <NSArray: 0x608000059410>; layer = <UIWebLayer: 0x61800002c680>>",

"<UIImageView: 0x7fbc8b10d680; frame = (3 194.5; 349 2.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x6000000309a0>> - (null)",

"<UIImageView: 0x7fbc8b10edf0; frame = (349.5 3; 2.5 194); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x600000030ba0>> - (null)"

)

/* 下面有两个方法*/

/*****************************************************/

/- 第一个 -/

if ([WebViewLastView isKindOfClass:[NSClassFromString(@"_UIWebViewScrollView") class]]) {

WebViewHeight = WebViewLastView.contentSize.height;

}

/- 获取网页现有的frame -/

CGRect WebViewRect = webView.frame;

/- 改版WebView的高度 -/

WebViewRect.size.height = WebViewHeight;

/- 重新设置网页的frame -/

webView.frame = WebViewRect;

/*****************************************************/

/* 第二种*/

if ([WebViewLastViewisKindOfClass:[NSClassFromString(@"_UIWebViewScrollView")class]]) {

UIView * WebViewLastViewB = [WebViewLastView.subviewsfirstObject];

if ([WebViewLastViewBisKindOfClass:[NSClassFromString(@"UIWebBrowserView")class]]) {

WebViewHeight = WebViewLastViewB.frame.size.height;

}

/* 获取网页现有的frame*/

CGRect WebViewRect = webView.frame;

/* 改版WebView的高度*/

WebViewRect.size.height = WebViewHeight;

/* 重新设置网页的frame*/

webView.frame = WebViewRect;

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

3、一个网页的层次图

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