如何在iPhone的按钮中保持选中的状态

我用以下方法解决了这个问题:

初始化方法:

• 为正常和选定状态创建具有已定义图像的按钮数。
• 为每个按钮指定标记(例如,第i个按钮标记为1000+i)。

动作方法:

• 选择发件人。

代码如下:

- (void)init {

....INITIALIZE SCROLLVIEW HERE.....

    for ( int i = 0; i < 10; i++ ) {
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

        [btn setFrame:.....];
        [btn setImage:_IMAGE_ forState:UIControlStateNormal];
        [btn setImage:_IMAGE2_ forState:UIControlStateSelected];
        [btn setTag:i + 1000];

        [btn addTarget:self action:@selector(setSelectedButton:) forControlEvents:UIControlEventTouchUpInside];

        [self addSubview:btn];
    }
}

- (IBAction)setSelectedButton:(id)sender {
    [self setSelectedButtonByIndex:((UIButton *)sender).tag - 1000];
}

- (void)setSelectedButtonByIndex:(NSInteger)index {
    if ( selectedElemId >= 0 ) {
        UIButton *btn = (UIButton *)[self viewWithTag:selectedElemId + 1000];
        [btn setSelected:NO];
    }

    UIButton *btn = (UIButton *)[self viewWithTag:index + 1000];
    [btn setSelected:YES];

    selectedElemId = btn.tag - 1000;
}