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  • UIButton中的三个UIEdgeInsets属性

    接着昨天的 UIButton中的三个UIEdgeInsets属性 ,今天我们具体谈谈UIButton的contentEdgeInsets、titleEdgeInsets、imageEdgeInsets属性。 

    创建UIButton

    UIButton *button = [[UIButton alloc] init];button.frame = CGRectMake(50, 200, 200, 50);[button setTitle:@"我是UIButton" forState:UIControlStateNormal];[button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];[button setBackgroundColor:[UIColor orangeColor]];button.titleLabel.textAlignment = NSTextAlignmentLeft;button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;[self.view addSubview:button];

    创建一个button,让button的title居左,以便观察:

    UIButton的contentEdgeInsets属性

    @property(nonatomic)UIEdgeInsets contentEdgeInsets UI_APPEARANCE_SELECTOR; // default is UIEdgeInsetsZero

    contentEdgeInsets里有一个content应该指的就是UIButton的title。

    参数含义

    上一篇文章我们讲了UIEdgeInsets是个结构体类型。里面有四个参数,分别是:top, left, bottom, right。这四个参数表示距离上边界、左边界、下边界、右边界的距离。

    这四个参数的值可以为正值,也可以为负值。拿left举例:

    left = 10; //代表以当前位置为基准,向右移动10个像素left = -10; //代表以当前位置为基准,向左移动10个像素

    向右移动20个像素

    button.contentEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);

    向右移动20个像素,left = 20,就可以了。

    向左移动20个像素

    button.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);

    UIButton的titleEdgeInsets属性

    titleEdgeInsets和contentEdgeInsets的作用差不多。我们及设置contentEdgeInsets,又设置titleEdgeInsets,会怎样呢?

    button.titleEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);button.contentEdgeInsets = UIEdgeInsetsMake(0, 20 , 0, 0);

    看一下效果:

    UIButton的titleEdgeInsets属性

    创建一个带照片的button

    UIButton *button = [[UIButton alloc] init];
    button.frame = CGRectMake(50, 200, 200, 200);
    [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor orangeColor]];
    [button setImage:[UIImage imageNamed:@"test"] forState:UIControlStateNormal];
    [self.view addSubview:button];

    运行一下:

    向右移动50个像素

    button.imageEdgeInsets = UIEdgeInsetsMake(0, 50, 0, 0);

    看看效果:

    向左移动50个像素

    button.imageEdgeInsets = UIEdgeInsetsMake(0, -50, 0, 0);

    看看效果:

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  • 原文地址:https://www.cnblogs.com/mafeng/p/5724571.html
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