iOS 懒加载

#import"ViewController.h"

@interfaceViewController()

@property(nonatomic,strong)UILabel*label;

@end

@implementationViewController

-(void)viewDidLoad {

[superviewDidLoad];

[self.viewaddSubview:self.label];

}

-(UILabel*)label

{

if(_label==nil)

{

_label=[[UILabelalloc]initWithFrame:CGRectMake(0,0,300,300)];

_label.text=@"asdadsasdas";

_label.backgroundColor=[UIColorredColor];

}

return_label;

}