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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。
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:
@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。
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
button.contentEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);
向右移动20个像素,left = 20,就可以了。
button.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);
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 *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:
button.imageEdgeInsets = UIEdgeInsetsMake(0, 50, 0, 0);
看看效果:
button.imageEdgeInsets = UIEdgeInsetsMake(0, -50, 0, 0);
看看效果:
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原文地址:http://www.cnblogs.com/mafeng/p/5724571.html