创建uibutton子类 [英] create uibutton subclass

问题描述

我试图将UIButton子类化为包含一个活动指示符，但是当我使用initWithFrame :(因为我是uibutton的子类，我不使用buttonWithType :)按钮不会显示。另外，在这种情况下我如何设置按钮类型？：

I tried to subclass UIButton to include an activity indicator, but when i use initWithFrame:(since i'm subclassing uibutton i'm not using buttonWithType:) the button doesn't display. Also how would i set the button type in this case?:

我的视图控制器：

    ActivityIndicatorButton *button = [[ActivityIndicatorButton alloc] initWithFrame:CGRectMake(10, 10, 300, 44)];
    [button addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];
    [button setTitle:@"Older Posts..." forState: UIControlStateNormal];
    [cell addSubview:button];
    [button release];

my activityindicatorbutton class：

my activityindicatorbutton class:

#import <Foundation/Foundation.h>


@interface ActivityIndicatorButton : UIButton {

    UIActivityIndicatorView *_activityView;
}

-(void)startAnimating;
-(void)stopAnimating;
@end

@implementation ActivityIndicatorButton

- (id)initWithFrame:(CGRect)frame {
    if (self=[super initWithFrame:frame]) {
        _activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        _activityView.frame = CGRectOffset(_activityView.frame, 60.0f, 10.0f);

        [self addSubview: _activityView];
    }
    return self;
}

-(void) dealloc{
    [super dealloc];
    [_activityView release];
    _activityView = nil;
}

-(void)startAnimating {
    [_activityView startAnimating];
}

-(void)stopAnimating {
    [_activityView stopAnimating];
}
@end

推荐答案

你真的不想继承 UIButton 。它是一个类集群，因此单个实​​例将类似于 UIRoundRectButton 或其他一些私有Apple类。你想做什么需要一个子类？

You don’t really want to subclass UIButton. It’s a class cluster, so individual instances will be something like UIRoundRectButton or some other private Apple class. What are you trying to do that requires a subclass?

这篇关于创建uibutton子类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！