CODEWITHSUNDEEP
objective-cuilabel
iosDev
iosDev

Reputation: 604

label displaying null if string not giving any value .... want to display nothing if no value given by string

i am using label to display data from various string but if string is not giving any value i want to display nothing in label but hare in below code it is displaying "null" if no value is given by sting. i don't want to display null in label .... how can i solve it.

where_do_you_hurt.text = [NSString stringWithFormat:@"%@,%@,%@,%@",appdelegate.hurt_head,appdelegate.hurt_Arm,
                          appdelegate.hurt_leg,appdelegate.hurt_chest,appdelegate.hurt_Back];

Upvotes: 3

Views: 4459

Answers (7)

MGY
MGY

Reputation: 8463

Here is the macro that I use for safe string instead of getting "(null)" string on a UILabel for example:

#define SafeString(STRING) ([STRING length] == 0 ? @"" : STRING)

NSLog(@"%@", member.name); // prints (null) on UILabel

with macro:

NSLog(@"%@", SafeString(member.name)); // prints empty string on UILabel

nice and clean solution.

Upvotes: 1

Ramesh Muthe
Ramesh Muthe

Reputation: 811

import these file directly in your project and use rMtext instead of text property.

#import <UIKit/UIKit.h>

@interface UILabel (NullHandling)
@property(nonatomic,copy)   NSString       *rMtext; 
@end

#import "UILabel+NullHandling.h"
#import <objc/message.h>

@implementation UILabel (NullHandling)
-(void)setRMtext:(NSString *)text {

if(text!=nil){
text = [text stringByReplacingOccurrencesOfString:@"(null)" withString:@""];
    self.text=text;     
  }
}
-(NSString *)rMtext {

    return self.text; 
}
@end

Upvotes: 0

Shaheen Ghiassy
Shaheen Ghiassy

Reputation: 7517

This is how I did it. Its not as compact as the others, but its more readable I feel (which is always most important to me).

It also has the benefit of removing trailing whitespaces from the beginning and the end.

// Remove any nulls from the first or last name
firstName = [NSString stringWithFormat:@"%@", (firstName ? firstName : @"")];
lastName = [NSString stringWithFormat:@"%@", (lastName ? lastName : @"")];

// Concat the strings
fullName = [NSString stringWithFormat:@"%@ %@", firstName, lastName];

// Remove any trailing whitespace
fullName = NSString *newString = [oldString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

Upvotes: 0

user1168492
user1168492

Reputation:

u can check for null using

if (title == (id)[NSNull null] || title.length == 0 ) title = @"Something";

Upvotes: 0

Jesse Black
Jesse Black

Reputation: 7976

About NSString... [NSString stringWithFormat:@"%@", nil] will log as (null)

You could put your text together incrementally, testing for nil values.

OR

You could initialize those 4 properties in your appdelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.hurt_head = [NSString string];
    self.hurt_Arm = [NSString string];
    self.hurt_leg = [NSString string];
    self.hurt_chest = [NSString string];
    self.hurt_back = [NSString string];
    //...
}

Upvotes: 0

DarkDust
DarkDust

Reputation: 92306

For each value that you don't want to have (null) printed, you need to provide an empty string if the value is nil. You can do so like this:

foo = [NSString stringWithFormat:@"%@", (obj ? obj : @"")];

The obj ? obj : @"" means: if the object is not nil (obj ?) then pass the object (obj), otherwise pass the empty string (: @"").

An alternative would be use to a mutable string and then do:

if (obj) {
    [foo appendFormat:@"%@", obj];
}

Upvotes: 16

Tom Dalling
Tom Dalling

Reputation: 24115

If you don't want "null" to appear for nil objects, then you need to supply an empty string instead:

where_do_you_hurt.text = [NSString stringWithFormat:
                          @"%@,%@,%@,%@",
                          appdelegate.hurt_head ? appdelegate.hurt_head : @"",
                          appdelegate.hurt_Arm ? appdelegate.hurt_Arm : @"",
                          appdelegate.hurt_leg ? appdelegate.hurt_leg : @"",
                          appdelegate.hurt_chest ? appdelegate.hurt_chest : @"",
                          appdelegate.hurt_Back ? appdelegate.hurt_Back : @""];

Upvotes: 2

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