爲什麼UITextField子類背景圖像不顯示？

Question

我有一個UITextField在界面生成器中設置了背景圖片。後臺顯示正常，但是當我將Class名稱切換（在IB中）到我的UITextField子類（ValidatedTextField）時，背景圖像不顯示。任何人都可以找到爲什麼圖像不應該在我的UITextView子類的任何原因？

其他信息
不知道這是否幫助，但IB也已經給我一些麻煩 - 有時不是讓我改變這些文本字段的類名..

//ValidatedTextField.h 
#import <UIKit/UIKit.h> 
#import "MBValidated.h" 

@interface ValidatedTextField : UITextView <MBValidated> 

// the maximum characters allowed 
@property (assign, nonatomic) int mbMaxLength; 

// an visual indicator of the validation state (checkmark, etc) 
@property (strong, nonatomic) UIImageView *mbStatusImageView; 

// whether the field can be empty 
@property (assign, nonatomic) BOOL mbIsRequired; 

// whether we have succesfully validated 
@property (assign, nonatomic) BOOL mbIsValid; 

// validate and update stored validated state 
-(BOOL)mbValidate; 

@end 




// ValidatedTextField.m 
#import "ValidatedTextField.h" 

@implementation ValidatedTextField 

@synthesize mbMaxLength, mbStatusImageView; 

- (id)initWithFrame:(CGRect)frame 
{ 
    self = [super initWithFrame:frame]; 
    if (self) { 
     // Initialization code   
    } 
    return self; 
} 

// set any default values here 
-(void)mbSetDefaults 
{ 
    self.mbIsRequired = YES; 
    self.mbIsValid = YES; 
} 

-(BOOL)mbValidate 
{  
    // validate length 
    if(self.text.length > self.mbMaxLength) self.mbIsValid = NO; 

    // validate empty or filled 
    if(self.text.length == 0 && self.mbIsRequired == YES) self.mbIsValid = NO; 

    return self.mbIsValid; 
} 

- (void)awakeFromNib 
{ 
    // set defaults 
    [self mbSetDefaults]; 
} 

@end 


// MBValidated Protocol 
#import <Foundation/Foundation.h> 

@protocol MBValidated <NSObject> 

// whether the field can be empty 
@property (assign, nonatomic) BOOL mbIsRequired; 

// whether we have succesfully validated 
@property (assign, nonatomic) BOOL mbIsValid; 

// validate the item 
-(BOOL)mbValidate; 

@end 

Answer 1

你應該繼承UITextField而不是UITextView。