Cocoa中的Webview无法加载

Question

它保持抛出错误：接收器类型webFrame，例如消息是线上的前向声明“[[webView mainFrame] loadRequest：[NSURLRequest requestWithURL：[NSURL URLWithString：urlStr]]]] ;”

我.h文件中

@interface AttendanceWizardAppDelegate : NSObject <NSApplicationDelegate> 
{ 
@private WebView *webView; 

} 
@property (weak) IBOutlet WebView *webView; 
@property (assign) IBOutlet NSWindow *window; 

@end 

我.m文件

#import "AttendanceWizardAppDelegate.h" 

@implementation AttendanceWizardAppDelegate 


@synthesize Username = _Username; 
@synthesize Password = _Password; 
@synthesize webView = _webView; 
@synthesize webber = _webber; 
@synthesize window = _window; 

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification 
{ 
NSString *urlStr = @"www.google.com"; 
[[webView mainFrame ] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlStr]]]; 
} 

@end 

Answer 1

你只需要添加的WebKit头的进口在你的头文件：

#import <WebKit/WebKit.h> 

您的代码也可以通过不为您声明的属性定义实例变量来简化：

头文件（.H）：

#import <Cocoa/Cocoa.h> 
#import <WebKit/WebKit.h> 

@interface AttendanceWizardAppDelegate : NSObject <NSApplicationDelegate> 
// No need for a iVar declaration 

@property (weak) IBOutlet WebView *webView; 
@property (assign) IBOutlet NSWindow *window; 

@end 

实现文件（.M）：

#import "AttendanceWizardAppDelegate.h" 

@implementation AttendanceWizardAppDelegate 

// Simplified synthesize declarations (no reference to the iVar) 
@synthesize Username; // I suggest you change the name of this variable ; the convention is to start the name of your property with a lower case letter, to not confuse it with a class name 
@synthesize Password; 
@synthesize webView; 
@synthesize webber; 
@synthesize window; 

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification 
{ 
    NSString *urlString = @"www.google.com"; 

    [[self.webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]]; // Note the use of self.webView, to use the getter you created by declaring the property 
} 

@end