iOS在界面生成器中使用繼承的View

Question

我擴展了UIImageView以便創建更圓的圖像視圖：

#import <QuartzCore/QuartzCore.h>
#import "RoundedImageView.h"
@implementation RoundedImageView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self makeImageViewRounded];
    }
    return self;
}

-(void) makeImageViewRounded {
    self.layer.backgroundColor=[[UIColor clearColor] CGColor];
    self.layer.cornerRadius=20;
    self.layer.borderWidth=1.0;
    self.layer.masksToBounds = YES;
    self.layer.borderColor=[[UIColor whiteColor] CGColor];
}


/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end

在故事板上，我已經將UIImageView連接到我的自定義RoundedImageView，但是它似乎並沒有影響視圖，也沒有調用我的代碼。

我如何使每當我將自定義視圖附加到UIView時，都會初始化該自定義視圖？

Answer 1

從情節提要板創建視圖時，請重寫此初始化程序：

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder: aDecoder];

    if (self) {
        [self makeImageViewRounded];
    }

    return self;
}