iphone - iOS 应用中自定义 UIButton 旁边出现“蓝框”

Question

我正在开发一个 iPhone 应用程序，它充当开关灯泡的遥控器，我正在使用 UIButtons 来执行此操作：

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchDown];

[button setBackgroundImage:bulb_on forState:UIControlStateSelected];
[button setBackgroundImage:bulb_off forState:UIControlStateNormal];

button.frame = CGRectMake(SPACING_LEFT + (BUTTON_SPACING * buttonNum) % (NUMBER_OF_HORIZONTAL_BUTTONS * BUTTON_SPACING), SPACING_TOP + y_padding, BUTTON_SIZE_X, BUTTON_SIZE_Y);

[self.scrollView addSubview:button];

一切正常，除了一点点，但仍然令人讨厌的细节：

如您所见，所选按钮的左上角有某种蓝色“框”或阴影。正常状态下的按钮没有这个东西。这可能来自什么，以及如何删除它？

Answer 1

我认为这是因为你创建了一个UIButtonTypeRoundedRectnot abuttonWithType:UIButtonTypeCustom

像这样做：

UIButton *button = [[UIButton alloc]initWithFrame: CGRectMake(SPACING_LEFT + (BUTTON_SPACING * buttonNum) % (NUMBER_OF_HORIZONTAL_BUTTONS * BUTTON_SPACING), SPACING_TOP + y_padding, BUTTON_SIZE_X, BUTTON_SIZE_Y)];
[button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchDown];

[button setBackgroundImage:bulb_on forState:UIControlStateSelected];
[button setBackgroundImage:bulb_off forState:UIControlStateNormal];

[self.scrollView addSubview:button];

Answer 2

默认按钮类型是System，将按钮的类型更改为Custom。

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要修复的代码：

[UIButton buttonWithType:UIButtonTypeCustom];

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要修复的情节提要：

请参阅屏幕截图以在故事板中修复。

Answer 3

以编程方式尝试此操作[UIButton buttonWithType:UIButtonTypeCustom];