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[英]How to change image from UIImageView by sliding right or left from UIViewController
[英]Why this code doens't work??? trying to change image from UIImageView if swiped right or left
我很瘋狂,為什么下面的代碼不起作用...
我有一個帶有UIImageView的簡單UIViewController,並且想要嘗試在用戶向右或向左滑動時更改圖像。 我是iPhone開發的新手。
謝謝
#import "SummerViewController.h"
@implementation SummerViewController
//@synthesize scroll;
@synthesize imgClothes, images;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
-(void)LeftSwiped
{
NSLog(@"swiped left");
imgClothes.image = [UIImage imageNamed:[images objectAtIndex:0]];
}
-(void)RightSwiped
{
NSLog(@"swiped right");
imgClothes.image = [UIImage imageNamed:[images objectAtIndex:1]];
}
- (void)viewDidLoad
{
images = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"1.jpg"],
[UIImage imageNamed:@"2.jpg"], nil];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(LeftSwiped)];
swipeLeft.numberOfTouchesRequired = 1;
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeLeft];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(RightSwiped)];
swipeRight.numberOfTouchesRequired = 1;
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swipeRight];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
.h文件:
@interface SummerViewController : UIViewController
{
//IBOutlet UIScrollView *scroll;
IBOutlet UIImageView *imgClothes;
NSArray *images;
}
@property (nonatomic, retain) IBOutlet UIImageView *imgClothes;
@property (nonatomic, retain) IBOutlet NSArray *images;
@end
UIImageView *imgClothes
。 您應該編寫類似imgClothes = [[UIImageView alloc] init(...)];
@interface SummerViewController : UIViewController <UIGestureRecognizerDelegate>
initWithNibName
中進行initWithNibName
,而不是在ViewDidLoad
初始化。 但這不應該引起您的問題。 您所有的代碼對於更改UIImageView的圖像都是正確的。根據您的代碼片段,我發現了兩種情況
1.確保將IBOutlet參考從XIB添加到imgClothes
2.如果“ 1”點符合,請嘗試檢查是否將您的imgClothes參考添加到self.view 。
希望以上兩種情況都能解決這個問題。
不要忘記一件事
1) swipeRight.delegate = self;
//將委托分配給滑動對象。
如果您使用的是sdk 3.2或更高版本,則使用UIGestureRecognizer類非常容易,否則請訪問以下參考以檢測滑動
https://gist.github.com/791725
希望這個能對您有所幫助..
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