摘要:
(1)创建字符串 NSString* str = @"Hello World"; NSString* str = [ [NSString alloc] initWithUTF8String:"Hello World"]; //C语言字符串 NSString* str = [ [NSString al 阅读全文
摘要:
Objective-C内存管理机制分成两种:MRC和ARC (1)MRC (Manual Reference Counting) 当前系统默认都是采用ARC,如果想使用MRC需要在build settings里把Objective-C Automatic Reference Counting设置成N 阅读全文