iOS中Button控件的學習

依舊是先建立一個single View Application工程，這個程序的操作是完全按照視頻學習上寫的，但最後還是運行不出來。設置斷點後發現buttin的狀態一直都沒改變，原來又是變量的從屬關係沒處理好，果斷在前面加了self，運行後果斷成功！

也就是將：

if (clearButton.enabled == YES)

    {

        clearButton.enabled = NO;

        smallButton.enabled = NO;

        [((UIButton *) sender) setTitle:@"Enable" forState:UIControlStateNormal];

    }else

    {

        clearButton.enabled = YES;

        smallButton.enabled = YES;

        [((UIButton *)sender) setTitle:@"Disable" forState:UIControlStateNormal];

    }

改爲：

if (self.clearButton.enabled == YES)

    {

        self.clearButton.enabled = NO;

        self.smallButton.enabled = NO;

        [((UIButton *) sender) setTitle:@"Enable" forState:UIControlStateNormal];

    }else

    {

        self.clearButton.enabled = YES;

        self.smallButton.enabled = YES;

        [((UIButton *)sender) setTitle:@"Disable" forState:UIControlStateNormal];

    }

下面是完整的.h和.m文件：

//

//  HXViewController.h

//  basicControl

//

#import <UIKit/UIKit.h>

@interface HXViewController : UIViewController

{

    IBOutlet UIButton *clearButton;

    IBOutlet UIButton *smallButton;

}

@property (retain,nonatomic)UIButton *clearButton;

@property (retain,nonatomic)UIButton *smallButton;

- (IBAction)disableBu:(id)sender;

@end

//

//  HXViewController.m

//  basicControl

//

#import "HXViewController.h"

@interface HXViewController ()

@end

@implementation HXViewController

@synthesize clearButton = _clearButton;

@synthesize smallButton = _smallButton;

- (IBAction)disableBu:(id)sender

{

    if (self.clearButton.enabled == YES)

    {

        self.clearButton.enabled = NO;

        self.smallButton.enabled = NO;

        [((UIButton *) sender) setTitle:@"Enable" forState:UIControlStateNormal];

    }else

    {

        self.clearButton.enabled = YES;

        self.smallButton.enabled = YES;

        [((UIButton *)sender) setTitle:@"Disable" forState:UIControlStateNormal];

    }

}

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (void)dealloc

{

    [_clearButton release];

    [_smallButton release];

    [super dealloc];

}

@end