創(chuàng)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];
創(chuàng)建一個button，讓button的title居左，以便觀察：
button1 (1).png
UIButton的contentEdgeInsets屬性
@property(nonatomic) UIEdgeInsets contentEdgeInsets UI_APPEARANCE_SELECTOR; // default is UIEdgeInsetsZero
contentEdgeInsets里有一個content應(yīng)該指的就是UIButton的title。
參數(shù)含義
上一篇文章我們講了UIEdgeInsets是個結(jié)構(gòu)體類型。里面有四個參數(shù)，分別是：top, left, bottom, right。這四個參數(shù)表示距離上邊界、左邊界、下邊界、右邊界的距離。
這四個參數(shù)的值可以為正值，也可以為負值。拿left舉例：
left = 10; //代表以當前位置為基準，向右移動10個像素
left = -10; //代表以當前位置為基準，向左移動10個像素
top = 10; //代表以當前位置為基準，向下移動10個像素
top = -10; //代表以當前位置為基準，向上移動10個像素
向右移動20個像素
button.contentEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);
Paste_Image.png
向左移動20個像素
button.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);
Paste_Image.png
UIButton的titleEdgeInsets屬性
titleEdgeInsets和contentEdgeInsets的作用差不多。我們及設(shè)置contentEdgeInsets，又設(shè)置titleEdgeInsets，會怎樣呢？
button.titleEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);
button.contentEdgeInsets = UIEdgeInsetsMake(0, 20 , 0, 0);
看一下效果：
3
UIButton的imageEdgeInsets屬性
創(chuàng)建一個帶照片的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];
運行一下：
Paste_Image.png
向右移動50個像素
button.imageEdgeInsets = UIEdgeInsetsMake(0, 50, 0, 0);
看看效果：
Paste_Image.png
向左移動50個像素
button.imageEdgeInsets = UIEdgeInsetsMake(0, -50, 0, 0);
看看效果：
Paste_Image.png
