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Austin Lopesilvero
11,081 PointsConfused how "the implementation" was made
I don't understand how the code magically changes from: ```Objective C
import <Foundation/Foundation.h>
@interface Sphere : NSObject {
NSArray *_center;
float _radius;
}
-(void)setRadius:(float)radius;
-(float)radius;
-(void)setCenter:(NSArray *)center;
-(NSArray *)center;
to:
```ObjectiveC
#import "Sphere.h"
@implementation Sphere
-(void)setRadius:(float)radius {
_radius = radius;
}
-(float)radius {
return _radius;
}
@end
This video and the next seem very confusing and fast compared to all of the other Treehouse videos I've watched
5 Answers
Joseph Lau
5,420 PointsI find this course poorly taught with heavy use of jargon and prose of a emotionless robot, definitely not well-suited for beginning programmers. I too got stumped at first with the quick transition of files. I don't understand why he chose to use a shortcut without explaining it. I also realized he talks about classes without ever explanation to us what a class even is. This course is probably better suited for people already with a background in programming.
I mean, some Treehouse instructors just sound like they're reading off a book with a blank face staring at the screen. In this lesson, he's even crossing his arms. It's quite unbearable sometimes.
Check out this pointers lecture at a university and compare it to Treehouse's:
https://www.youtube.com/watch?v=Rxvv9krECNw
Clearly, this guy has PASSION.
Stone Preston
42,016 PointsThose are 2 different files. the first is the .h file (interface file) the second is the .m file (implementation file). The instructor is magically switching between the 2 files using a keyboard short cut (command + control + up/down arrows)
Austin Lopesilvero
11,081 PointsI guess I was confused becaused the .h file was still selected in the file menu on the left. I guess his shortcut does not affect that. Thank you for your quick reply!
Austin Lopesilvero
11,081 PointsStone Preston , is there another resource that I could look at to go over for content convered in Structs to Objects, Syntax Overview, and @Property videos. I took the quiz but I feel like I still don't have a grasp of what is going on.
Stone Preston
42,016 PointsId probably watch the videos again a second time. Pause the videos when you start getting confused. Think about the code you just wrote and what each line does.
Objective C can be a tricky thing to understand, if you still feel lost with things I would maybe check out http://www.raywenderlich.com/ Here is a tutorial specifically covering properties.
Keep in mind this first course is just a brief introduction to the language, and is by no means the end all be all of understanding the language itself. That takes years. So its ok if you feel a bit lost, we all do sometimes.
Austin Lopesilvero
11,081 PointsCool! I appreciate your help again.