ios開發之UIWebView自適應高度例子

UIWebView使用時當無法確切的設定一個固定的高度時，就需要根據網頁內容來自適應高度了，參考代碼如下：

//
//  ViewController.m
//  UIwebView高度自適應
//
//  Created by mac on 16/3/18.
//  Copyright © 2016年 ZMIT. All rights reserved.
//
 
#import "ViewController.h"
 
@interface ViewController ()<UIScrollViewDelegate,UIWebViewDelegate>{
    UIWebView *myWebView;
}
 
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor grayColor];
    myWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width, 30)];
    myWebView.delegate = self;
    myWebView.scrollView.delegate = self;
    myWebView.scalesPageToFit = YES;//自動對頁面進行縮放以適應螢幕
    [self.view addSubview:myWebView];
    
    NSURL *url = [NSURL URLWithString:@"http://www.111cn.net/"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [myWebView loadRequest:request];
}
#pragma mark - 代理方法
-(void)webViewDidFinishLoad:(UIWebView *)webView{
    CGFloat webViewHeight = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"]floatValue];
    CGRect newFrame = webView.frame;
    newFrame.size.height = webViewHeight;
    webView.frame = newFrame;
    //重新設定webView的contentSize
    myWebView.scrollView.contentSize = newFrame.size;
    //如果WebView塊下面還有其他的控制項，可在此處根據myWebView設定其frame
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
 
@end