桥接的三种方式

Y_Atz

于 2016-06-06 22:30:52 发布

阅读量1.5k

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文章标签： ios开发管理内存桥接方式

本文链接：https://blog.youkuaiyun.com/a244573118/article/details/51598758

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    // 桥接方式一：手动管理内存
    NSString *firstNameStr = (__bridge NSString *)(firstName);
    
    NSString *lastNameStr = (__bridge NSString *)(lastName);
    
    NSLog(@"firstName: %@    lastName: %@",firstNameStr,lastNameStr);
    
    CFRelease(firstName);
   
    CFRelease(lastName);
    
    // 桥接方式二: 2.1不需要手动管理内存
    NSString *firstNameStr = CFBridgingRelease(firstName);
    
    NSString *lastNameStr = CFBridgingRelease(lastName);
    
    NSLog(@"firstName: %@    lastName: %@",firstNameStr,lastNameStr);
    
    // 2.2将对象的所有权转换
    NSString *firstNameStr = (__bridge_transfer NSString *)firstName;
    
    NSString *lastNameStr = (__bridge_transfer NSString *)lastName;
    
    NSLog(@"firstName: %@    lastName: %@",firstNameStr,lastNameStr);
    
    // 桥接方式三: Foundation 转换为CoreFoundation   不常用
   
    (__bridge_retained <#CF type#>)<#expression#>)