CODEWITHSUNDEEP
iosobjective-cblocktypedef
three-blocks
three-blocks

Reputation: 363

Unknown type name 'NSString' when I define a block

When I define my block in my .h file, there comes an issue:

Unknown type name NSString

My code is below:

typedef void(^CancelBlock)();
typedef void(^ConfirmBlck)(NSString *); // this line comes the error


#import <UIKit/UIKit.h>


@interface LMLUpspringView : UIView

@property (nonatomic, copy) CancelBlock cancelBlock;
@property (nonatomic, copy) ConfirmBlck confirmBlock;


@end

But, why is my first block ok and the second report's an error?

Upvotes: 0

Views: 4644

Answers (4)

Arun Panneerselvam
Arun Panneerselvam

Reputation: 2335

In latest versions of xcode you can simply specify 

#import <Foundation/NSString.h>

any NS Foundation class can be imported as needed.

Upvotes: 0

Ajjjjjjjj
Ajjjjjjjj

Reputation: 675

position declaration uikit import then follow:

// declare
@property(nonatomic,strong)void(^ConfirmBlck)(NSString * string); 

// define
[self setConfirmBlck:^(NSString *indexpVal) { }];

// call 
if (self.ConfirmBlck) {
    self.ConfirmBlck(selectedVal);
}

Upvotes: -1

KKRocks
KKRocks

Reputation: 8322

you need to declare block as below 

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

    typedef void(^ConfirmBlck)(NSString * string);

Upvotes: 2

aircraft
aircraft

Reputation: 26876

You define block above the #import <UIKit/UIKit.h> (in the .h file), so there did not import the NSString, you should cut the #import <UIKit/UIKit.h> above the block define.

Upvotes: 3

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