Ios 如何禁用自定义UIButton

我对

UIButton

进行了子类化，并在

drawRect

方法中进行了一些自定义绘制，例如绘制

NSAttributedString

和

UIImage

但是，在我执行此操作之后，当

启用

设置为

否

时，自定义的

ui按钮

不会变灰。我认为我的自定义绘图发生在它的状态之上。我该怎么处理

在此处共享我的绘图代码：

- (void)drawRect:(CGRect)rect
{
    // Drawing code
    if (self.faceUp) {
        [self drawCardText:self.card.contents inRect:self.bounds];
    } else {
        [self drawCardImage:[UIImage imageNamed:CardBackImageName] inRect:self.bounds];
    }
}

- (void)drawCardText:(NSString *)text inRect:(CGRect)rect
{
    // set background color to white so text can be shown
    [[UIColor whiteColor] setFill];
    [[UIBezierPath bezierPathWithRect:rect] fill];

    UIFont *preferedFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
    UIFont *actualFont = [UIFont fontWithName:preferedFont.fontName
                                     size:hypotf(rect.size.width, rect.size.height) / 6.0];

    NSDictionary *attributes = @{NSFontAttributeName: actualFont};

    NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:attributes];
    [self setAttributedTitle:attributedText forState:UIControlStateNormal];
}

- (void)drawCardImage:(UIImage *)image inRect:(CGRect)rect
{
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 1.0f);
    [image drawInRect:rect];
    UIImage *actualImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [[UIColor colorWithPatternImage:actualImage] setFill];
    [[UIBezierPath bezierPathWithRect:rect] fill];
}

你可以用

 btn.userInteractionEnabled = NO; 

btn.enabled = NO;

或者你可以使用

 btn.userInteractionEnabled = NO; 

btn.enabled = NO;

希望这有帮助……：）

编辑：

我想你可以用这个

[btn setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];

添加以下内容：

-(void)setEnabled:(BOOL)enabled{

if (!enabled) {
    self.alpha = 0.3;
}else{
    self.alpha = 1.0;
}
[super setEnabled:enabled];

---

}

您可能需要自己添加一个带有灰色和一些alpha的覆盖视图。再次启用按钮时删除覆盖。您可以将此方法添加到CustomButton类

-(void)setEnabled:(BOOL)enabled{

    //disableLayer.hidden = !enabled;
    if (enabled) {
        //self.enabled = YES;
        self.alpha = 1.0;
    }else{
        //self.enabled = NO;
        self.alpha = 0.7;
    }
    [super setEnabled:enabled];
}

用于启用或禁用调用-

[customButtob setEnabled:buttonStatus];

如果要更改颜色，请添加背景层，并在setEnabled方法中切换其隐藏属性

disableLayer = [CALayer layer];
disableLayer.backgroundColor = [UIColor colorWithRed:20/255.0f green:20/255.0f blue:20/255.0f alpha:1.0f].CGColor;
disableLayer.frame = self.layer.bounds;
disableLayer.hidden = YES;
[self.layer insertSublayer:disableLayer below:otherLayer];  

---

我想你可以分享一些关于你的实现的更多细节。而且我相信你已经打过电话了

Super methods in the customized methods at first call.

---

您必须覆盖

CustomButton的
setEnabled:
方法

-(void)setEnabled:(BOOL)enabled
{
    if (!enabled) {
        [self setAlpha:0.2f];
    }
}

或

如果必须在禁用状态下更改UIButton的颜色。您可以将
drawRect:
方法更改为

为
BOOL
类型变量创建
assign
属性（例如isEnabled）

添加一个方法，它可以帮助您启用和禁用您的按钮，只需在自定义按钮类中添加此方法

 //in customButton.h file
 #import <UIKit/UIKit.h>  


 @interface CustomButton : UIButton
 @property (nonatomic,assign) BOOL faceUp;//your property
 - (void)makeButtonDisable:(BOOL)disable;//method to handle disable and enable
 @end


 //in customButton.m file

 #import "CustomButton.h"
@implementation CustomButton
{
  CALayer *grayLayer;//layer to handle disable and enable
}
@synthesize faceUp;

  //  in initilization method
  - (id)initWithFrame:(CGRect)frame
   {
     self = [super initWithFrame:frame];
     if(self)
     {
      grayLayer = [CALayer layer];
      grayLayer.frame = frame;
      [self.layer addSublayer:grayLayer]; //add the grayLayer during initialisation 
     }
     return self;
   }



//your code that put above
- (void)drawRect:(CGRect)rect
 {
  // Drawing code
  if (self.faceUp) {
    [self drawCardText:self.card.contents inRect:self.bounds];
    } else {
    [self drawCardImage:[UIImage imageNamed:CardBackImageName] inRect:self.bounds];
   }
 }

 - (void)drawCardText:(NSString *)text inRect:(CGRect)rect
{
   // set background color to white so text can be shown
   [[UIColor whiteColor] setFill];
   [[UIBezierPath bezierPathWithRect:rect] fill];

   UIFont *preferedFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
   UIFont *actualFont = [UIFont fontWithName:preferedFont.fontName
                                 size:hypotf(rect.size.width, rect.size.height) / 6.0];

   NSDictionary *attributes = @{NSFontAttributeName: actualFont};

   NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:attributes];
   [self setAttributedTitle:attributedText forState:UIControlStateNormal];
 }

 - (void)drawCardImage:(UIImage *)image inRect:(CGRect)rect
 {
   UIGraphicsBeginImageContextWithOptions(rect.size, NO, 1.0f);
   [image drawInRect:rect];
   UIImage *actualImage = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();

   [[UIColor colorWithPatternImage:actualImage] setFill];
   [[UIBezierPath bezierPathWithRect:rect] fill];
 }

 //add this method 
 - (void)makeButtonDisable:(BOOL)disable
 {
    if(disable)
    {
     grayLayer.backgroundColor = [UIColor colorWithRed:201.0f/255.0f green:201.0f/255.0f blue:201.0f/255.0f alpha:5.0f].CGColor;
    self.userInteractionEnabled = NO;
    grayLayer.opacity = 0.5f;
    self.alpha = 0.5f;
   }
   else
   {
    grayLayer.backgroundColor = [UIColor clearColor].CGColor;
    self.userInteractionEnabled = YES;
    grayLayer.opacity = 0.0f;
    self.alpha = 1.0f;
   }

}

我认为这个问题是不同的。当按钮被禁用时，它看起来不像禁用（像灰色表示禁用）。@bohanl Ya我理解。你能展示一下你的绘图代码吗？@Mani，更新了这个问题，让它更简洁confusing@Rashad，共享了上面的我的代码，
[btn setTitleColor:[UIColor grayColor]用于状态：UIControlStateDisabled]不起作用。我试过了。你能显示你的代码吗？我想在drawRect:上添加一个检查按钮是否被禁用，并在那里正常绘制灰色的东西。我不确定是否在已启用<代码>的设置程序中实现了<代码>设置需要显示。否则，当我将
enabled
设置为
NO
时，它如何知道重新绘制？@bohanl看到我的答案，可能会对您有所帮助。@bohanl覆盖setEnabled并调用setneedsdplay，我想。好的一点，我确实忘记了。但是添加
[super-drawRect:rect]
没有帮助。