Basic knowledge of IOS development-fragmentation 46, basic knowledge of ios-46

Basic knowledge of IOS development-fragmentation 46, basic knowledge of ios-46

1: URL Processing with Chinese characters

// Required * path = (_ bridge_transfer NSString *) equals (NULL, (_ bridge cfstringref1_model.mp4 _ url, CFSTR (""), equals (NSUTF8StringEncoding ));

2: Take the WebView height

- (void)webViewDidFinishLoad:(UIWebView *)webView  {      CGFloat height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];      CGRect frame = webView.frame;      webView.frame = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, height);  }  

3: Some rounded corners of UIView

UIView * view2 = [[UIView alloc] initWithFrame: CGRectMake (120, 10, 80, 80)]; view2.backgroundColor = [UIColor redColor]; [self. view addSubview: view2]; UIBezierPath * maskPath = [UIBezierPath paths: view2.bounds byRoundingCorners: outputs | UIRectCornerBottomRight cornerRadii: CGSizeMake (10, 10)]; CAShapeLayer * maskLayer = [[CAShapeLayer alloc] init]; maskLayer. frame = view 2. bounds; maskLayer. path = maskPath. CGPath; view2.layer. mask = maskLayer; // among them, byRoundingCorners: UIRectCornerBottomLeft | UIRectCornerBottomRight // specifies the corner to be rounded. This parameter is of the UIRectCorner type and has the following optional values: * UIRectCornerTopLeft * UIRectCornerTopRight * UIRectCornerBottomLeft * UIRectCornerBottomRight * UIRectCornerAllCorners

4: force the App to exit directly

- (void)exitApplication {    AppDelegate *app = [UIApplication sharedApplication].delegate;    UIWindow *window = app.window;    [UIView animateWithDuration:1.0f animations:^{        window.alpha = 0;    } completion:^(BOOL finished) {        exit(0);    }];}

5. Modify the placeholder color and size.

TextField. placeholder = @ "Enter the user name"; [textField setValue: [UIColor redColor] forKeyPath: @ "_ placeholderLabel. textColor "]; [textField setValue: [UIFont boldSystemFontOfSize: 16] forKeyPath: @" _ placeholderLabel. font "];

6. Cancel the system response gesture.

self.navigationController.interactivePopGestureRecognizer.enabled = NO;

7: Change the WebView Font/color

UIWebView: you cannot set the font size, color, and font through its own attributes. You can only set the font attributes using html code after loading the webView:

-(Void) webViewDidFinishLoad :( UIWebView *) webView {NSString * str = @ "document. getElementsByTagName ('body') [0]. style. webkitTextSizeAdjust = '000000' "; [webView stringByEvaluatingJavaScriptFromString: str];} or add the following code NSString * jsString = [[NSString alloc] initWithFormat: @" document. body. style. fontSize = % f; document. body. style. color = % @ ", fontSize, fontColor]; [webView stringByEvaluatingJavaScriptFromString: jsString];

8: WebView image adaptive screen

- (void)webViewDidFinishLoad:(UIWebView *)webView {  NSString *js = @"function imgAutoFit() { \     var imgs = document.getElementsByTagName('img'); \     for (var i = 0; i < imgs.length; ++i) {\        var img = imgs[i];   \        img.style.maxWidth = %f;   \     } \  }";  js = [NSString stringWithFormat:js, [UIScreen mainScreen].bounds.size.width - 20];   [webView stringByEvaluatingJavaScriptFromString:js];  [webView stringByEvaluatingJavaScriptFromString:@"imgAutoFit()"];}