Question

我有两个状态的简单UIButton。我为button UIControlEventTouchDown事件添加了一项操作。当button处于正常状态时，一切都很好，当我触摸button时会调用方法。但当button位于selected state时，当我触摸button时没有任何反应，只有当我释放手指时，状态才会变为正常状态（如UIControlEventTouchUpInside）。

我该如何解决这个问题？

我使用这种方法创建我的按钮：

- (UIButton *) createButtonWithFrame:(CGRect)frame title:(NSString *)title {
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setFrame:frame];
    [button setTitle:title forState:UIControlStateNormal];
    [button setTitleColor:UIColorFromRGB(0x3a3a3a) forState:UIControlStateNormal];
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
    [[button titleLabel] setFont:[UIFont fontWithName:@"Gotham-Bold" size:10]];
    [button setBackgroundImage:[UIImage imageNamed:@"button.png"] forState:UIControlStateNormal];
    [button setBackgroundImage:[UIImage imageNamed:@"button_pressed.png"] forState:(UIControlStateSelected)];
    [button setAdjustsImageWhenHighlighted:NO];
    [button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchDown];
    return button;
}

buttonPressed:就像这样：

- (void) buttonPressed:(UIButton *)sender {
    [sender setSelected:!sender.selected];
}

Answer 1

试试这个，

从代码中删除此行

[button setBackgroundImage:[UIImage imageNamed:@"button_pressed.png"] forState:(UIControlStateSelected)];

并且这样做，

- (void) buttonPressed:(UIButton *)sender {

    if([[sender backgroundImageForState:UIControlStateNormal] isEqual:[UIImage imageNamed:@"button.png"]])
        [sender setBackgroundImage:[UIImage imageNamed:@"button_pressed.png"] forState:UIControlStateNormal];
    else
        [sender setBackgroundImage:[UIImage imageNamed:@"button.png"] forState:UIControlStateNormal];
}

UIControlEvents选定按钮的TouchDown工作不正确

1 个答案: