如何使一個UIWebView在Objective-C

Question

看不見我不得不隱藏的UIView的UIWebView的onload事件，並說明它被點擊一個的UIButton只有當......我試試這個：

在.hi創建IBOutlet中對應於xib。

#import <UIKit/UIKit.h> 

@interface SingleViewController : UIViewController{ 

    UIWebView *gif; 
    UIButton *go; 
} 
@property(nonatomic,retain) IBOutlet UIWebView *gif; 
@property(nonatomic,retain) IBOutlet UIButton *go; 
@end 

在.M我試圖隱藏的UIWebView以這樣的方式

@implementation SingleViewController 
@synthesize sug; 
@synthesize gif; 
@synthesize avvia; 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     gif.hidden=YES; 
     UIImage *keys = [UIImage imageNamed:@"chiave.png"]; 
     [self.go setImage:chiave forState:UIControlStateNormal];    
     [self.go setImage:chiave forState:UIControlStateHighlighted];   
     [self.go setImage:chiave forState:UIControlStateDisabled];    
     [self.go setImage:chiave forState:UIControlStateSelected]; 
    } 
    return self; 
} 

，我以這種方式加載此的UIView：

SingleViewController *single = [[SingleViewController alloc]initWithNibName:@"SingleViewController" bundle:nil]; 
[self.view addSubview:single.view]; 

錯在何處？

Answer 1

你需要等到viewDidLoad:被調用來隱藏UIWebView。這是因爲您的筆尖中的項目尚未實例化，並且調用nil對象上的方法將不起作用。

- (void)viewDidLoad 
{ 
     gif.hidden=YES; 
     UIImage *keys = [UIImage imageNamed:@"chiave.png"]; 
     [self.go setImage:chiave forState:UIControlStateNormal];    
     [self.go setImage:chiave forState:UIControlStateHighlighted];   
     [self.go setImage:chiave forState:UIControlStateDisabled];    
     [self.go setImage:chiave forState:UIControlStateSelected]; 
} 

Answer 2

一對夫婦的建議：

確保initWithNibName：包：實際上是被調用，因爲如果視圖控制器從筆尖文件直接裝也未必。

當你添加你的子視圖時，一定要設置它的框架。