。

git学习笔记总结自这里写链接内容 - git的创建 1创建空目录 $ mkdir learngit $ cd learngit $ pwd /Users/xufanjie/learngit 2将目录变为git管理的仓库``` $ git init Initialized empty Git repository in /Users/xufanj

以NSString与NSMutableString举例 NSMutableString 拷贝 NSString NSString *str1 = @"xfj"; NSMutableString *str2 = [str1 mutableCopy]; [str2 appendString:@"123"]; NSLog(@"%@ %@",str1,str2); N

#define singleH(name) +(instancetype)share##name;#if __has_feature(objc_arc)#define singleM(name) static id _instance ;\ + (instancetype)allocWithZone:(struct _NSZone *)zone{\ static dispatch_once_t on

回看以前的代码 发现自己在还没有接触UIGestureRecognizer时就实现过UIScrollView中UIImageView的缩放 发现UIScrollView有一个代理方法可以实现 核心代码:@interface ViewController ()<UIScrollViewDelegate>@property(nonatomic, strong) UIScrollView *mainS