iOS View的一些操作定义为宏

#define ViewOf(__View__,__TAG__) [__View__ viewWithTag:__TAG__]
#define LabelOf(__View__,__TAG__) ((UILabel*)[__View__ viewWithTag:__TAG__])
#define ImageOf(__View__,__TAG__) ((UIImageView*)[__View__ viewWithTag:__TAG__])
#define ButtonOf(__View__,__TAG__) ((UIButton*)[__View__ viewWithTag:__TAG__])

#define View(__TAG__) [theView viewWithTag:__TAG__]
#define Label(__TAG__) ((UILabel*)[theView viewWithTag:__TAG__])
#define Image(__TAG__) ((UIImageView*)[theView viewWithTag:__TAG__])
#define Button(__TAG__) ((UIButton*)[theView viewWithTag:__TAG__])

#define LabelCreate(__TAG__) UILabel* label_##__TAG__ = [[UILabel alloc] init];\
label_##__TAG__.tag = __TAG__;\
[theView addSubview:label_##__TAG__];

#define ImageCreate(__TAG__) UIImageView* image##__TAG__ = [[UIImageView alloc] init];\
image##__TAG__.tag = __TAG__;\
image##__TAG__.contentMode = UIViewContentModeCenter;\
[theView addSubview:image##__TAG__];

#define ViewCreate(__TAG__) UIView* view##__TAG__ = [[UIView alloc] init];\
view##__TAG__.tag = __TAG__;\
[theView addSubview:view##__TAG__];

#define XYZDelegateValid (self.xyzDelegate && [self.xyzDelegate respondsToSelector:@selector(XYZResponse:)])