UIView Subclass initWithFrame not being called?

问题

I have a custom UIView subclass. In IB, I have specified a "placeholder" UIView and set the class to my class name. My override of drawRect method is working, and the background is coloring properly, but the initWithFrame is not firing. Why?

- (id)initWithFrame:(CGRect)frame {
    NSLog(@"initWithFrame");
    if ((self = [super initWithFrame:frame])) {
        noteTextFont = [[UIFont boldSystemFontOfSize:12] retain];
    }
    return self;
}

- (void)drawRect:(CGRect)rect {
    [super drawRect:rect];
    CGContextRef context = UIGraphicsGetCurrentContext();

    UIColor *backgroundColor = [UIColor blackColor];
    [backgroundColor set];
    CGContextFillRect(context, rect);

    UIColor *labelColor = [UIColor lightGrayColor];
    [labelColor set];
    [notificationLabel drawInRect:CGRectMake(44, 18, rect.size.width-20, rect.size.height) withFont:noteTextFont lineBreakMode:UILineBreakModeTailTruncation];

    [self setNeedsLayout];
}

回答1:

Things loaded from a nib are inited with -(id)initWithCoder:(NSCoder*)coder

回答2:

because you are initializing this view from a nib it looks like, so it is using the default (UIView's) initWithNibName: instead of initializing using initWithFrame:

来源：https://stackoverflow.com/questions/3425598/uiview-subclass-initwithframe-not-being-called