摘要：
@Property的strong 与weakstrong关键字与retain关似，用了它，引用计数自动＋1，用实例更能说明一切@property(nonatomic,strong)NSString*string1; @property(nonatomic,strong)NSString*string2; 有这样两个属性，@synthesizestring1; @synthesizestring2; 猜一下下面代码将输出什么结果？self.string1=@"String1"; self.string2=self.string1; self.string1=nil; NSLo 阅读全文
摘要：
一：获取documents目录路径//1，获取家目录路径的函数：NSString*homeDir =NSHomeDirectory();//2，获取Documents目录路径的方法：a:NSArray*paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);NSString*docDir = [pathsobjectAtIndex:0];b:[NSHomeDirectory()stringByAppendingPathComponent:@"Documents" 阅读全文