NSUserDefaults -- 写读&配置

<pre name="code" class="objc">NSUserDefaults

1.可以保存一些简单的数据

2.可以定制应用的行为

NSUserDefaults *d = [NSUserDefaults standardUserDefaults];

//write
[d setObject:@"iCrazy" forKey:@"name"];
[d setInteger:20 forKey:@"age"];
[d setFloat:1.81 forKey:@"height"];
[d synchronize];//将内存里的数据长久保存
 

//read
NSString *name = [d objectForKey:@"name"];
NSInteger *age = [d integerForKey:@"age"];
float height = [d floatForKey:@"height"];
//print
NSLog(@"name = %@,age = %d,height = %.2f",name,age,height);

setting bundle  里添加以开关，其他为自动添加的控件





获取setting中的信息：

 NSUserDefaults *d = [NSUserDefaults standardUserDefaults];
bool wifi_switch = [d boolForKey:@"WIFI"];
NSString *name = [d objectForKey:@"name_preference"];
NSLog(@"wifi switch = %d,name = %@",wifi_switch,name);

//   配置完设置，如果setting里没有显示，就重新启动iphone模拟器即可，我刚开始也是试了好多遍才知道重启。