iOS自定义xib属性

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XIB和Storyboard提供操作View的属性还是很少，例如XIB中不支持view设置圆角（Key Path非可视化），而iOS8中为我们带来了新的可能。

Objective-C IBDesignable/IBInspectable

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#import <UIKit/UIKit.h>
@interface IB_UIView : UIView 
@property (nonatomic, assign)IBInspectable CGFloat cornerRadius; 
@end
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IB_DESIGNABLE
@implementation IB_UIView

- (void)setCornerRadius:(CGFloat)cornerRadius {
    _cornerRadius = cornerRadius;
    self.layer.cornerRadius  = _cornerRadius;
    self.layer.masksToBounds = YES;
}
@end

Swift IBDesignable/IBInspectable

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import UIKit
@IBDesignable class IB_UIView: UIView {

    @IBInspectable var cornerRadius: CGFloat
}

效果如下：

LM