新浪微博客户端(48)-添加删除按钮到表情键盘

- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {

UIButton *deleteBtn = [[UIButton alloc] init];
[deleteBtn setImage:[UIImage imageNamed:@"compose_emotion_delete"] forState:UIControlStateNormal];
[deleteBtn setImage:[UIImage imageNamed:@"compose_emotion_delete_highlighted"] forState:UIControlStateHighlighted];
[self addSubview:deleteBtn];
self.deleteBtn = deleteBtn;

}
return self;
}

- (void)layoutSubviews {

[super layoutSubviews];

CGFloat emotionW = (self.width - 2 * DJEmotionPageViewPadding) / DJEmotionPageViewMaxCols;
CGFloat emotionH = (self.height - DJEmotionPageViewPadding) / DJEmotionPageViewMaxRows;

NSUInteger emotionsCount = self.emotions.count;
for (int i = 0; i < emotionsCount; i++) {
UIView *emotionView = self.subviews[i+1]; // 遍历应该从第1个按钮，不应该从第0个,因为第0个View是删除按钮
emotionView.x = (i % DJEmotionPageViewMaxCols) * emotionW + DJEmotionPageViewPadding;
emotionView.y = (i / DJEmotionPageViewMaxCols) * emotionH + DJEmotionPageViewPadding;
emotionView.width = emotionW;
emotionView.height = emotionH;
}

// 删除按钮
CGFloat deleteBtnW = emotionW;
CGFloat deleteBtnH = emotionH;
CGFloat deleteBtnX = self.width - DJEmotionPageViewPadding - deleteBtnW;
CGFloat deleteBtnY = self.height - deleteBtnH;
self.deleteBtn.frame = CGRectMake(deleteBtnX, deleteBtnY, deleteBtnW, deleteBtnH);

}