懒加载的使用

//
//  LazyViewController.m
//  Share
//
//  Created by lanouhn on 15/1/20.
//  Copyright (c) 2015年 niutiantian. All rights reserved.
//

#import "LazyViewController.h"

@interface LazyViewController ()

@end

@implementation LazyViewController

- (void)dealloc
{
    self.myLabel = nil;
    [super dealloc];
}


//1.懒加载基本

//懒加载——也称为延迟加载，即在需要的时候才加载（效率低，占用内存小）。所谓懒加载，写的是其get方法.

//注意：如果是懒加载的话则一定要注意先判断是否已经有了，如果没有那么再去进行实例化
//
//2.使用懒加载的好处：

//（1）不必将创建对象的代码全部写在viewDidLoad方法中，代码的可读性更强

//（2）每个控件的getter方法中分别负责各自的实例化处理，代码彼此之间的独立性强，松耦合

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.myLabel.text = @"1111111";
}
    //label延迟加载
    //判断是否已经有了lable 没有则实例化
-(UILabel *)myLabel{
    if (!_myLabel) {
        self.myLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 50, 50)];
        [self.view addSubview:_myLabel];
        [_myLabel release];
    }
    return _myLabel;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end