Question

我使用UIImageView创建了一堆可拖动的图像，我希望保存图像的位置。我已经尝试使用NSUserDefaults保存触摸图像的CGPoint，然后在打开视图控制器时通过CGRectMake加载它的位置。当我运行并打开该视图控制器时出现错误。

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch =[[event allTouches] anyObject];
CGPoint location = [touch locationInView:self.view];
//create location as CGPoint 

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

[defaults setObject:NSStringFromCGPoint(location) forKey:@"key"];
//get location as NSString

[defaults synchronize];
//saves
}

CGPoint中图像的最后位置将转换为NSString并保存。

-(void)viewDidLoad {
[super viewDidLoad];

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
CGPoint position = CGPointFromString([defaults objectForKey:@"s1X"]);
//set position as CGpoint 

profile[1].frame = CGRectMake(position.x, position.y, 25, 35);
//assign image using the coordinates saved.
}

打开View控制器时，应该加载位置，但是当我打开Viewcontroller时模拟器会停止。请帮我解决这个错误。

编辑：我使用NSMutableArray存储CGPoint，当我运行代码并打开页面模拟器再次终止时（线程1：信号SIGABRT）。而且我找不到为数组分配索引的方法。

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
//UITouch *touch =[[event allTouches] anyObject];
UITouch *touch =[touches anyObject];
CGPoint location = [touch locationInView:self.view];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSMutableArray *dataArray = [[NSMutableArray alloc] init];

for(int i=1; i<12; i++) {
    if(profile[i].isExclusiveTouch) {
        [dataArray addObject:[NSValue valueWithCGPoint:CGPointMake(location.x, location.y)] objectAtIndex:i];
        // how to store the CGPoint at i index?
    }
  }
[defaults setObject:dataArray forKey:@"key"];
[defaults synchronize];
}


- (void)viewDidLoad {
[super viewDidLoad];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSArray *dataArray = [defaults objectForKey:@"key"];
//Only showed 3 images for example
CGPoint point1 = [[dataArray objectAtIndex:1] CGPointValue];
CGPoint point2 = [[dataArray objectAtIndex:2] CGPointValue];
CGPoint point3 = [[dataArray objectAtIndex:3] CGPointValue];
profile[1].frame = CGRectMake(point1.x-11, point1.y-15, 22, 30);
profile[2].frame = CGRectMake(point2.x-11, point2.y-15, 22, 30);
profile[3].frame = CGRectMake(point3.x-11, point3.y-15, 22, 30);
}

另一个问题 如何将CGPoint分配给索引i？

valueWithCGPoint:CGPointMake(location.x, location.y)]];
//Can't use objectAtIndex or atIndex to assign, there will be error.

无法使用从NSUserDefaults保存的CGPoint定位uiimageview并将CGpoint输入到CGRectMake

0 个答案: