Question

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I have two error : No visible @interface for ‘UIWebview’

Why I get this error at Xcode. Error is that:No visible @interface for ‘UIWebView’ declares the selector ‘highlightAllOccurencesOfString:’ and No visible @interface for ‘UIWebView’ declares the selector ‘removeAllHighlights’. Where are wrong?

WBSecondViewController.h

#import <UIKit/UIKit.h>

@interface WBSecondViewController : UIViewController <UIWebViewDelegate, UIScrollViewDelegate>{}

@property (weak, nonatomic) IBOutlet UIWebView *webView;
@property (weak, nonatomic) IBOutlet UIToolbar *webToolBar;

- (IBAction)searchButtonPressed:(id)sender;
- (IBAction)clearHighlights:(id)sender;

- (NSInteger)highlightAllOccurencesOfString:(NSString*)str;
- (void)removeAllHighlights;

@end

WBSecondViewController.m

#import "WBSecondViewController.h"

@interface WBSecondViewController ()
@end

@implementation WBSecondViewController

-(IBAction)searchButtonPressed:(id)sender{
NSLog(@"highlighttes");
[_webView highlightAllOccurencesOfString:@"不明"];
}

-(IBAction)clearHighlights:(id)sender{
[_webView removeAllHighlights];
}

- (NSInteger)highlightAllOccurencesOfString:(NSString*)str
{
NSString *path = [[NSBundle mainBundle] pathForResource:@"UIWebViewSearch" ofType:@"js"];
NSString *jsCode = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
[_webView stringByEvaluatingJavaScriptFromString:jsCode];

NSString *startSearch = [NSString stringWithFormat:@"uiWebview_HighlightAllOccurencesOfString('%@')",str];
[_webView stringByEvaluatingJavaScriptFromString:startSearch];

NSString *result = [_webView stringByEvaluatingJavaScriptFromString:@"uiWebview_SearchResultCount"];
return [result integerValue];
}

- (void)removeAllHighlights
{
[_webView stringByEvaluatingJavaScriptFromString:@"uiWebview_RemoveAllHighlights()"];
}

@end

Answer 1

These two lines are wrong,

[_webView highlightAllOccurencesOfString:@"不明"];
[_webView removeAllHighlights];

It should be,

[self highlightAllOccurencesOfString:@"不明"];
[self removeAllHighlights];

You are trying to call highlightAllOccurencesOfString and removeAllHighlights which are defined in WBSecondViewController‘s @interface but on UIWebview objects. Compiler is not able to find it in UIWebView class @interface and hence the error message as No visible @interface for 'UIWebView' declares the selector ...