objective-c - @property (nonatomic, copy) void(^doTransferMsg)(NSString *_msg)

Question

不是很明白
@property (nonatomic, copy) void(^doTransferMsg)(NSString *_msg)

这种声明属性方式。只知道void(^doTransferMsg)这是使用block方式声明方法。

Answer 1

Maybe it’s easier to understand this way
.h

typedef void(^doTransferMsg)(NSString *_msg);
@property (nonatomic, copy) doTransferMsg transferMsg;

.m

@synthesize transferMsg;
[self setTransferMsg:^(NSString *str)
{
  NSLog(@"hello %@",str);
}];
transferMsg(@"navy");
transferMsg(@"navy2");

Answer 2

You will understand if you think of block as a common type. There is no difference between block and common types here. They just define an attribute of this type.