Print out an array in objective-c

Question

I have a problem about printing an array. I am a java user, and i am new to objective-c.

in java code, i show u what i want

 for(myClass a: myVariable){
     System.out.println(a.toString);
 }

so how do i do this in objective-c, i have written like this:

- (void) updateTextField:(NSMutableArray *)array{
    for (Storage *obj in array)   // Storage class holds a name and a price.
        [check setText:@"%@",[obj description]];  // i did override the description method to print out the name and price.  and "Check" is my textField; 
}

it does not work. [check setText:@"%@",obj description]; got error "too many argument to method call if i take out the description;"

here is my Storage.m #import "Storage.h"

@implementation Storage


@synthesize name;
@synthesize price;

- (NSString *)description {
    return [NSString stringWithFormat: @"%@        %@", name, price];
}

@end

You should say either obj.description or [obj description]. The use of [] for method calls is very disorienting when coming from Java. — Hot Licks
– Hot Licks, Commented Jan 29, 2013 at 20:54
hey guys, i did try this [check setText:@"%@",[obj description]]; but it still show me an error " too many argument to method call, expected 1 but 2;" — VinsonG
– VinsonG, Commented Jan 29, 2013 at 20:56
You can't simply use @"%@" and get something formatted. It needs to be something like [NSString stringWithFormat:@"%@",[obj description]]. (You were the one who wanted to switch from Java.) — Hot Licks
– Hot Licks, Commented Jan 29, 2013 at 21:01
Note that the description method shouldn't be used in production code. Great for debugging/logging/learning, though. — bbum
– bbum, Commented Jan 29, 2013 at 21:02
(Or, for a full statement, [check setText:[NSString stringWithFormat:@"%@",[obj description]]];) — Hot Licks
– Hot Licks, Commented Jan 29, 2013 at 21:02

Firo · Accepted Answer · 2013-01-29 21:06:25Z

1

Based on your commented error on Ryan's post you could try this:

- (void) updateTextField:(NSMutableArray *)array{
    for (Storage *obj in array)
        [check setText:[NSString stringWithString:obj.description]];
}

answered Jan 29, 2013 at 21:06

Firo

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1 Comment

Tommy Over a year ago

@user1933421 In strict Cocoa terms, that should be a lot of wasted processing — setText: implies you're setting a property so if your array is 1000 elements long then setting the value you don't want 999 times and then the actual value is a waste. If check is appending, you might consider a more compact form without the explicit loop like [[obj valueForKey:@"description"] componentsJoinedByString:@","]

cscott530 · Accepted Answer · 2013-01-29 21:05:53Z

1

The proper syntax for what you did would be [check setText:[NSString stringWithFormat: @"%@", [obj description]]];. But you can just use NSLog in a similar manner as Java's sysout:

for(Storage *obj in array)
    NSLog(@"%@", obj); //the description will be called implicitly, like toString()

answered Jan 29, 2013 at 21:05

cscott530

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Comments

StilesCrisis · Accepted Answer · 2013-01-29 21:07:10Z

1

Does -setText: take a format list or just an NSString?

That is, try:

- (void) updateTextField:(NSMutableArray *)array{
    for (Storage *obj in array)  
        [check setText:[obj description]];
}

answered Jan 29, 2013 at 21:07

StilesCrisis

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