内存五大区域
//栈
int a=10;
NSLog(@"%p",a);
//堆
int *p=malloc(40);
NSLog(@"%p",p);
//全局
static int b=10;
NSLog(@"%p",b);
//常量
char *str="iphone";
NSLog(@"%p",str);
//代码区
NSLog(@"%p",maxValue);
结果
2015-07-28 19:07:07.976 OC10_Block[829:71750] 0xa
2015-07-28 19:07:07.977 OC10_Block[829:71750] 0x1001068d0
2015-07-28 19:07:07.977 OC10_Block[829:71750] 0xa
2015-07-28 19:07:07.977 OC10_Block[829:71750] 0x100001f75Block的四种形式
//1.无参数,无返回值
void(^block)()=^(){
//函数大括号里的代码段
NSLog(@"今天有点多云");
};
//block的使用
block();
//block自己不会执行,必须调用才会执行block大括号里的代码段结果
2015-07-28 19:25:43.452 OC10_Block[1239:82416] 今天有点多云//2.有参数无返回值
void (^block)(int ,int)=^(int a,int b){
int max=a > b ? a : b;
NSLog(@"%d",max);
};
//调用
block(10,20);
//void (^block)(int ,int)是block的类型,它的名是block,我们也通过名进行调用结果
2015-07-28 19:27:08.121 OC10_Block[1249:82981] 20//3.有返回值无参数
//有返回值在函数段的最后要加上return
int(^block)()=^(){
return 100;
};
//block调用时没有参数也要加上括号
NSLog(@"%d",block());结果
2015-07-28 19:28:07.938 OC10_Block[1256:83327] 100 //4.有参数有返回值
NSString *(^block)(NSArray *,NSInteger)=^(NSArray *arr,NSInteger index){
return arr[index];
};
NSLog(@"%@",block(@[@"1",@"2"],1));
结果
2015-07-28 19:29:05.096 OC10_Block[1263:84049] 2练习
//返回整数,参数字符串
NSInteger (^block)(NSString *)=^(NSString *str){
return str.integerValue;
};
NSLog(@"%ld",block(@"111"));
结果
2015-07-28 19:30:42.921 OC10_Block[1271:85319] 111 //参数日期字符串,返回NSDate类型的日期对象
NSDate *(^block)(NSString *)=^(NSString *str){
NSDateFormatter *formatter=[[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH-mm-ss"];
return [formatter dateFromString:str];
};
NSLog(@"%@",block(@"2015-07-28 10:12:12"));
//block的函数段中更多使用参数,而返回值更多是调用一方使用结果
2015-07-28 19:31:33.543 OC10_Block[1278:86117] 2015-07-28 02:12:12 +0000//通过新的block写一个block
Block block=^(NSArray *arr){
return arr[0];
}; //block和局部变量
//__block相当于给a一个在block中修改的权限,否则他只能取值,不能赋值
__block int a=10;
void(^block)()=^(){
a=10*a;
NSLog(@"%d",a);
};
block();结果
2015-07-28 19:33:14.295 OC10_Block[1301:87551] 100 //通过block对数组进行遍历
NSArray *arr=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6", nil];
//系统的block
[arr enumerateObjectsUsingBlock:^(NSString * obj, NSUInteger idx, BOOL *stop) {
NSLog(@"%@",obj);
}];
//系统的block的用法就是回车
结果
2015-07-28 19:33:52.913 OC10_Block[1308:88218] 1
2015-07-28 19:33:52.914 OC10_Block[1308:88218] 2
2015-07-28 19:33:52.914 OC10_Block[1308:88218] 3
2015-07-28 19:33:52.914 OC10_Block[1308:88218] 4
2015-07-28 19:33:52.915 OC10_Block[1308:88218] 5
2015-07-28 19:33:52.915 OC10_Block[1308:88218] 6 //数组排序
//数组对字符串的排序
//不可变的数组
NSArray*[email protected][@"zhangyangyang",@"wuhe",@"liushansahn",@"wangjunmin",@"yanglin"];
//SEL是方法选择器,他是方法选择器的类型
NSArray*newArr[arrsortedArrayUsingSelector:@selector(compare:)];
NSLog(@"%@",newArr);
NSLog(@"%@",arr);
结果
2015-07-28 19:35:02.000 OC10_Block[1319:89130] (
zhangyangyang,
wuhe,
liushansahn,
wangjunmin,
yanglin
) //可变数组
NSMutableArray*arr[NSMutableArrayarrayWithObjects:@"zhangyangyang",@"wuhe",@"liushansahn",@"wangjunmin",@"yanglin", nil];
[arr sortUsingSelector:@selector(compare:)];
NSLog(@"%@",arr);
结果
2015-07-28 19:36:27.541 OC10_Block[1326:90109] (
liushansahn,
wangjunmin,
wuhe,
yanglin,
zhangyangyang
) //数组对对象的排序
//新建四个人
Person *per1=[Person baseWithName:@"yanglin" sex:@"nan"];
Person *per2=[Person baseWithName:@"wuhe" sex:@"nan"];
Person *per3=[Person baseWithName:@"cunmou" sex:@"nv"];
Person *per4=[Person baseWithName:@"liushanshan" sex:@"nan"];
//用字面量创建对象和便利构造器是一样的
NSArray *[email protected][per1,per2,per3,per4];
//以学生的姓名作为排序的依据
NSArray*newArr[arrsortedArrayUsingComparator:^NSComparisonResult(Person * obj1, Person* obj2) {
return -[obj1.name compare:obj2.name];
}];
for (Person *per in newArr) {
NSLog(@"%@",per.name);
}结果
2015-07-28 19:37:53.065 OC10_Block[1340:91155] yanglin
2015-07-28 19:37:53.066 OC10_Block[1340:91155] wuhe
2015-07-28 19:37:53.066 OC10_Block[1340:91155] liushanshan
2015-07-28 19:37:53.066 OC10_Block[1340:91155] cunmou Person *per1=[Person baseWithName:@"yanglin" sex:@"nan"];
Person *per2=[Person baseWithName:@"wuhe" sex:@"nan"];
Person *per3=[Person baseWithName:@"cunmou" sex:@"nv"];
Person *per4=[Person baseWithName:@"liushanshan" sex:@"nan"];
NSMutableArray *marr=[NSMutableArray arrayWithObjects:per1,per2,per3,per4, nil];
[marr sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
Person *per11=(Person *)obj1;
Person *per22=(Person *)obj2;
return [per11.name compare:per22.name];
}];
for (Person *per in marr) {
NSLog(@"%@",per.name);
}
结果
2015-07-28 19:38:59.851 OC10_Block[1347:91927] cunmou
2015-07-28 19:38:59.852 OC10_Block[1347:91927] liushanshan
2015-07-28 19:38:59.852 OC10_Block[1347:91927] wuhe
2015-07-28 19:38:59.852 OC10_Block[1347:91927] yanglin补充
主函数之前
// //C语言的函数
// NSInteger maxValue(NSInteger a,NSInteger b){
// return a > b ? a : b;
// }
void test1()
{
NSLog(@"今天真热");
}
int addNum(int a,int b){
return a+b;
}
typedef int DT;
//新的类型写在*的后面,就是这里的PFUN
typedef int (*PFUN)(int ,int ) ;
typedef NSString *(^Block)(NSArray *) ;
//有返回值,无参数
typedef NSInteger(^TestBlock)();//
// BaseModel.h
// OC10_Block
//
// Created by dllo on 15/7/28.
// Copyright (c) 2015年 zhozhicheng. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface BaseModel : NSObject
@property(nonatomic,copy)NSString *name;
@property(nonatomic,copy)NSString *sex;
-(id)initWithName:(NSString *)name
sex:(NSString *)sex;
+(id)baseWithName:(NSString *)name
sex:(NSString *)sex;
@end
//
// BaseModel.m
// OC10_Block
//
// Created by dllo on 15/7/28.
// Copyright (c) 2015年 zhozhicheng. All rights reserved.
//
#import "BaseModel.h"
@implementation BaseModel
-(id)initWithName:(NSString *)name
sex:(NSString *)sex{
self=[super init];
if (self) {
self.name=name;
self.sex=sex;
}return self;
}
+(id)baseWithName:(NSString *)name
sex:(NSString *)sex{
//多态方式完成
id obj =[[[self class] alloc] initWithName:name sex:sex];
return obj;
}
@end
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时间： 2024-11-03 22:02:40