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带NSInvocation的UI按钮

nsinvocation uibutton objective-c

0

Amarsh · 技术社区 · 14 年前

我试图添加一个按钮的编程方式,当按下它,一个特定的对象正在通过。我不断收到“未识别的选择器发送”异常。你能告诉我代码有什么问题吗

    // allocate the details button's action
    SEL selector = @selector(showPropertyDetails:forProperty:);
    NSMethodSignature *signature = [[self class] instanceMethodSignatureForSelector:selector];
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
    [invocation setSelector:selector];
    //The invocation object must retain its arguments
    [property retain];      
    //Set the arguments
    [invocation setTarget:self];
    [invocation setArgument:&property atIndex:3];       
    [(UIButton*)[myView viewWithTag:15] addTarget:self action:@selector(selector) forControlEvents:UIControlEventTouchDown];

再往下看,同一类中的方法如下所示:

-(void) showPropertyDetails:(id)something forProperty:(Property *)property {
int i=0;
}

3 回复 | 直到 14 年前

1

Georg Fritzsche 14 年前

NSInvocation selector 作为 action 为了按钮。此选择器应具有如下形式 - (void)foo:(id)sender , ... .

或存储其他参数。

2

1

Amarsh 14 年前

我用另一种方法解决了。子类UIButton并添加了我需要的所有属性。这门课看起来是这样的:

@interface RecentSalePropertyDetailsButton : UIButton {
    Property* property;
}
@property (nonatomic, retain) Property* property;
@end
@implementation RecentSalePropertyDetailsButton
@synthesize property;
- (id) initWithPropertyAs:(Property*)aProperty{
    [super init];
    self.property = aProperty;
    return self;
}
@end

然后,再往下看,我会做以下事情:

    // allocate the details button's action
    RecentSalePropertyDetailsButton* button = (RecentSalePropertyDetailsButton *)[myView viewWithTag:15];
    button.property = property;
    [button addTarget:self action:@selector(showRecentSalesPropertyDetails:) forControlEvents:UIControlEventTouchDown];

3

0

ssj 14 年前

//make a button
    UIButton *button = [UIButton buttonWithType:0];
//set button size
    button.frame = CGRectMake(20,219,280,106);
//give it a color
    button.backgroundColor = [UIColor clearColor];
//add a method
    [button addTarget:self action:@selector(cancel) forControlEvents:UIControlEventTouchUpInside];
//add it to the currentview 
    [self.view addSubview:button];