ios 协议（delegate）使用过程中遇到assign attribute must be unsafeunretained

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今天在使用协议的过程中，偶然发现这样使用

@interface AppDelegate (){
    id<ChatDelegate>  testdelegate;
}
@property (nonatomic , assign) id<ChatDelegate> testdelegate;

@end

@implementation AppDelegate
@synthesize testdelegate;

Existing instance variable ‘delegate‘ for property ‘delegate‘ with assign attribute must be unsafe unretained

修改成：

@interface AppDelegate (){
   __unsafe_unretained id<ChatDelegate>  testdelegate;
}
@property (nonatomic , assign) id<ChatDelegate> testdelegate;

@end

@implementation AppDelegate
@synthesize testdelegate;

参考：http://www.cnblogs.com/lyanet/archive/2013/05/07/3064290.html

ios 协议（delegate）使用过程中遇到assign attribute must be unsafeunretained

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原文地址：http://blog.csdn.net/lv_ruanruan/article/details/44751147