消息來禁用它

-1

這是我創建的UIButton代碼，消息來禁用它

- (void) setNavButton 
{ 
    self->_newbutton = [UIButton buttonWithType:UIButtonTypeCustom]; 
    UIImage *myImage = [UIImage imageNamed:@"[email protected]"]; 

    UIImageView *imageView = [[[UIImageView alloc] initWithFrame:CGRectMake(0,0, 46,57)] autorelease]; 

    CGContextRef context = UIGraphicsGetCurrentContext(); 
    CGContextSetAllowsAntialiasing(context, true); 
    CGContextSetShouldAntialias(context, true); 
    CGContextSetInterpolationQuality(context, kCGInterpolationHigh); 

    [imageView.layer setMinificationFilter:kCAFilterTrilinear]; 
    [imageView.layer setAllowsEdgeAntialiasing:YES]; 
    CGRect imageRect = CGRectMake(0,0, imageView.bounds.size.width+10, imageView.bounds.size.height); 

    UIGraphicsBeginImageContextWithOptions(imageRect.size, NO, [UIScreen mainScreen].scale); 

    [imageView.layer renderInContext:UIGraphicsGetCurrentContext()]; 
    [myImage drawInRect:CGRectMake(0,12,myImage.size.width,myImage.size.height)]; 
    myImage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 

    [imageView setImage:myImage]; 
    [self->_newbutton setImage:[imageView image] forState:UIControlStateNormal]; 
}

我創建屬性這一點，我訪問它在同一禁用它。但是，當這樣做，我得到和錯誤說'消息發送到一個釋放實例'。我正在使用下面的代碼來禁用它。

[self->_newbutton setEnabled:No];

來源

2016-02-05 Nikhil

任何原因爲'self - > _ newbutton'而不是'self._newbutton'？ – zcui93

In class.h UIButton * _newbutton; @property（nonatomic，retain）UIButton * newbutton;×只有一個額外的 – Nikhil

閱讀關於目標C點語法，這不是C++訪問指針的方式。 – zcui93

與

_newbutton = [UIButton buttonWithType:UIButtonTypeCustom];

同時設定圖像與

[_newbutton setImage:[imageView image] forState:UIControlStateNormal];

然後設置禁用爲

[self._newbutton setEnabled:No];

希望，它會幫你生成按鈕。
謝謝

來源

2016-02-05 09:29:07

問題在於Autoreleasing新按鈕。在被調用之前，新的按鈕變得更加靈活，所以它變成了一個Zobie對象。所以造成了一次撞車。非常感謝你..... – Nikhil

消息來禁用它

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