我有問題UILabel
。這裏有兩個文件的ViewController
和MainClass
首先是控制器的筆尖文件與label1
插座。第二個文件是另一個標籤mainLabel
,它包含文本(「從MainClass中的init方法設置」)的類。我想在ViewController
中設置mainLabel
到label1
。如何設置另一個類的UILabel文本
在MainClass的init
方法我設置文本爲mainLabel.text
mainLabel.text = @"Set from init method in MainClass";
之後,我打電話NSLog(@"%@",mainLabel.text);
但在控制檯我有空
2011-12-14 10:31:31.048 ClassTask[1076:f803] (null)
,然後後,我在- (void)viewDidLoad
調用label1 = newClass.mainLabel;
我有在我的iPhone模擬器中用label1
沒有文字查看。 // ViewController.h
#import <UIKit/UIKit.h>
#import "MainClass.h"
@interface ViewController : UIViewController {
UILabel *label1;
MainClass *newClass;
}
@property (nonatomic, retain) IBOutlet UILabel *testLabel;
@end
// ViewController.m
#import "ViewController.h"
@implementation ViewController
@synthesize label1;
-(void) dealloc{
[label1 release];
[super dealloc];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
newClass = [MainClass new];
label1 = newClass.mainLabel;
}
@end
// MainClass.h
#import <UIKit/UIKit.h>
@interface MainClass : NSObject {
UILabel *mainLabel;
}
@property (nonatomic, retain) IBOutlet UILabel *mainLabel;
@end
// MainClass.m
#import "MainClass.h" @implementation MainClass @synthesize mainLabel;
-(id) init {
if (self = [super init]) {
mainLabel.text = @"Set from init method in MainClass";
NSLog(@"%@",mainLabel.text);
}
return self; }
-(void)dealloc {
[mainLabel release];
[super dealloc];
}
@end