WKWebView  进度条设置

#import "wangmumu.h"
#import <WebKit/WebKit.h>

@interface wangmumu ()
@property (nonatomic, strong) WKWebView *htmlWebView;
@property (nonatomic, strong) UIProgressView *progressView;
@end

@implementation wangmumu

- (void)viewDidLoad {
    [super viewDidLoad];
    if ([self.isPop isEqualToString:@"pop"]) {
        [self setNavigationBarWhiteColor];
    } else {
        [self creatBack];
    }
}

- (void)createUI {
    [self.view addSubviewS:self.htmlWebView,self.progressView,nil];
    [self.htmlWebView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
}

- (void)updateView {
    kWeakSelf(self)
    [self.htmlWebView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.top.bottom.equalTo(weakself.view);
    }];
}

- (void)creatBack {
    UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:[UIImage imageNamed:@"Backicon"] forState:UIControlStateNormal];
    [button setImage:[UIImage imageNamed:@"Backicon"] forState:UIControlStateHighlighted];
    [button setImage:[UIImage imageNamed:@"Backicon"] forState:UIControlStateSelected];
    button.imageEdgeInsets = UIEdgeInsetsMake(0, -30, 0, 0);
    button.frame = (CGRect){{0,0},{40,40}};
    [[button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
        [self dismissViewControllerAnimated:YES completion:nil];
    }];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:button];
    self.navigationController.navigationBar.barTintColor = [UIColor whiteColor];
}

#pragma mark - KVC and KVO
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
    if ([@"estimatedProgress" isEqualToString:keyPath]) {
        [self.progressView setProgress:self.htmlWebView.estimatedProgress animated:YES];
    }
    
    if (self.progressView.progress == 0) {
        self.progressView.hidden = NO;
    } else if (self.progressView.progress == 1) {
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            if (self.progressView.progress ==1) {
                self.progressView.progress = 0;
                self.progressView.hidden = YES;
            }
        });
    }
}

#pragma mark --- 实例化
- (WKWebView *)htmlWebView {
    if (_htmlWebView == nil) {
        _htmlWebView = [[WKWebView alloc] init];
        NSURLRequest *requestUrl = [NSURLRequest requestWithURL:[NSURL URLWithString:self.getUrl]];
        [_htmlWebView loadRequest:requestUrl];
    }
    return _htmlWebView;
}

-(UIProgressView *)progressView {
    if (_progressView == nil) {
        CGRect  rect = CGRectZero;
        rect.size.width = [[UIScreen mainScreen]bounds].size.width;
        rect.size.height = 2;
        _progressView = [[UIProgressView alloc]initWithFrame:rect];
        _progressView.progressTintColor = [UIColor hexColor:@"#FFC400"];
        [_progressView setProgressViewStyle:UIProgressViewStyleDefault];
        [self.view addSubview:_progressView];
    }
    return _progressView;
}

- (void)dealloc {
    [self.htmlWebView removeObserver:self forKeyPath:@"estimatedProgress"];
    self.htmlWebView = nil;
    [self.htmlWebView removeFromSuperview];
}

@end