<p>有时, 我们需要在外部浏览器中打开百度界面, 并直接搜索某一段字符串, 我们可以通过下面的代码来完成这个需求

• 效果图:

效果图.gif

• 输入框中输入内容后, 通过点击View直接跳转Safari, 然后使用百度直接搜索指定字符串

#import "ViewController.h"

@interface ViewController ()

/** 输入框 */
@property (nonatomic, strong) UITextField *textField;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 100, 200, 40)];
    self.textField.borderStyle = UITextBorderStyleRoundedRect;
    [self.view addSubview:self.textField];
    
}


- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    // 没有内容直接返回
    if (self.textField.text.length == 0) return;
    
    // 需要搜索的内容
    NSString * keyword = self.textField.text;

    //适配 iOS9 字符串UTF8编码
    if (NSFoundationVersionNumber >= NSFoundationVersionNumber_iOS_9_0) {
         keyword = [keyword stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    }else {
        keyword = [keyword stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    }

    // 拼接链接字符传
    NSString * urlStart = @"https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=";
    NSString * urlEnd = @"&rsv_pq=80c7023000194588&rsv_t=e923%2BJi6SI0Q7Kl1q1%2BUl%2Bq7jbwN0GzkIghhykTbOJO0WX2%2BnR6iKTwQWLI&rsv_enter=1&inputT=7275&rsv_sug3=20&rsv_sug1=19&rsv_sug2=0&rsv_sug4=7642";
    NSMutableString * urlStr = [[NSMutableString alloc]init];
    [urlStr appendString:urlStart];
    [urlStr appendString:keyword];
    [urlStr appendString:urlEnd];


    NSURL * url = [NSURL URLWithString:[NSString stringWithString:urlStr]];

    //适配 iOS10 跳转Safari浏览器
    if ([[UIApplication sharedApplication] canOpenURL:url]) {
        if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_9_x_Max) {
            [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
        }else {
            [[UIApplication sharedApplication] openURL:url];
        }
    }
}

@end