Question

以下是我以编程方式创建按钮的代码：

NSArray *buttonImage=[NSArray arrayWithObjects:[UIImage imageNamed:@"Cover_0.png"],
                      [UIImage imageNamed:@"Cover_1.png"],
                      [UIImage imageNamed:@"Cover_2.png"],
                      [UIImage imageNamed:@"Cover_3.png"],
                      [UIImage imageNamed:@"Cover_4.png"],
                      [UIImage imageNamed:@"Cover_5.png"],
                      [UIImage imageNamed:@"Cover_6.png"],
                      [UIImage imageNamed:@"Cover_7.png"],nil];

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, 0, 200.0f, 200.0f);
[button setTitle:[NSString stringWithFormat:@"%i", index] forState:UIControlStateNormal];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
button.titleLabel.font = [button.titleLabel.font fontWithSize:50];

[button setImage:buttonImage forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
return button;

但是在运行它的时候，我无法进入模拟器并抛出一个Signal Sigabart错误。有人可以帮忙吗？

Answer 1

要使用选择器数组以编程方式创建按钮，您可以使用以下代码片段：

//定义策略

@interface DataItemStrategy : NSObject
@property(nonatomic, assign) SEL someSelector;
@end

@implementation DataItemStrategy

@synthesize someSelector = _someSelector;

-(id)initWithSelector:(SEL)someSelector
{
    self = [super init];
    if (self)
    {
        self.someSelector = someSelector;
    }
    return self;
}

@end


-(void)createButtons
{
    NSArray *buttonImages =[NSArray arrayWithObjects:[UIImage imageNamed:@"Cover_0.png"],
                          [UIImage imageNamed:@"Cover_1.png"],
                          [UIImage imageNamed:@"Cover_2.png"],nil];

    NSArray *dataStrategies = [NSArray arrayWithObjects:
                                   [[[DataItemStrategy alloc] initWithSelector:@selector(buttonAction0:)] autorelease],
                                   [[[DataItemStrategy alloc] initWithSelector:@selector(buttonAction1:)] autorelease],
                                   [[[DataItemStrategy alloc] initWithSelector:@selector(buttonAction2:)] autorelease], nil];

    CGRect buttonFrame = CGRectMake(0, 0, 50, 50);
    for (NSInteger i = 0; i < [buttonImages count]; i++)
    {
        buttonFrame.origin.y += 50;
        UIImage *buttonImage = [buttonImages objectAtIndex:i];
        DataItemStrategy *dataStrategie = [dataStrategies objectAtIndex:i];
        NSString *title = [NSString stringWithFormat:@"%d", i];
        UIButton *button = [self buttonWithFrame:buttonFrame image:buttonImage action:dataStrategie.someSelector title:title];
        [self.view addSubview:button];
    }    
}

-(UIButton *)buttonWithFrame:(CGRect)buttonFrame image:(UIImage *)buttonImage action:(SEL)buttonAction title:(NSString *)title
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = buttonFrame;
    [button setTitle:title forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    button.titleLabel.font = [button.titleLabel.font fontWithSize:50];

    [button setImage:buttonImage forState:UIControlStateNormal];
    [button addTarget:self action:buttonAction forControlEvents:UIControlEventTouchUpInside];
    return button;
}

Answer 2

您无法将图像数组设置为UIButton图像属性。如果您查看UIButton的文档，就会发现它需要UIImage。

Answer 3

你的代码中的索引是什么？设置此：

[button setBackgroundImage:[buttonImage objectAtIndex:index] forState:UIControlStateNormal];

Answer 4

修改下面的代码，将第一个图像设置为按钮/您可以使用for循环创建图像并将图像设置为uibuttons

NSArray *buttonImage=[NSArray arrayWithObjects:[UIImage imageNamed:@"Cover_0.png"],
                  [UIImage imageNamed:@"Cover_1.png"],
                  [UIImage imageNamed:@"Cover_2.png"],
                  [UIImage imageNamed:@"Cover_3.png"],
                  [UIImage imageNamed:@"Cover_4.png"],
                  [UIImage imageNamed:@"Cover_5.png"],
                  [UIImage imageNamed:@"Cover_6.png"],
                  [UIImage imageNamed:@"Cover_7.png"],nil];

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, 0, 200.0f, 200.0f);
[button setTitle:[NSString stringWithFormat:@"%i", index] forState:UIControlStateNormal];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
button.titleLabel.font = [button.titleLabel.font fontWithSize:50];

[button setImage:(UIImage*)[buttonImage objectAtIndex:1] forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
return button;

更改行

[button setImage:(UIImage*)[buttonImage objectAtIndex:1] forState:UIControlStateNormal];

这会将图像设置为按钮。您已发送数组以设置图像，因此应用程序将崩溃

Answer 5

尝试：[button setImage：[buttonImage objectAtIndex：index] forState：UIControlStateNormal];

如何通过编程方式为UIButtons组设置单个背景图像

5 个答案: