Question

我有一个视图，只有一个按钮UIButton。首次单击按钮将在按钮上方绘制一个正方形，第二次将用圆圈替换正方形。

我需要一些关于编写控制器代码的帮助。请引导我走正确的道路。感谢

Answer 1

设计一个形状类。将您的形状添加为UIImageViews。点击每个按钮，在点击时更改alpha。

@interface Shape: UIView {
  UIImageView *square;
  UIimageView *circle;
  BOOL isSquare;
}

@property (nonatomic, retain) UIImageView *square;
@property (nonatomic, retain) UIImageView *circle;
@property BOOL isSquare;

-(void)changeShape;
@end

@implementation Shape
@synthesize square;
@synthesize circle;
@synthesize isSquare;

- (id)initWithFrame:(CGRect)frame {

if ((self = [super initWithFrame:frame])) {

    self.frame = //frame size.


    //assume a square image exists.
    square = [[UIImageView alloc] initWithImage: [UIImage imageNamed: @"square.png"]];
    square.alpha = 1.0;
    [self addSubview: square];

    //assume a circle image exists.
    circle = [[UIImageView alloc] initWithImage: [UIImage imageNamed: @"circle.png"]];
    circle.alpha = 0.0;
    [self addSubview: circle];

    isSquare = YES;

    }
    return self;
}

-(void)changeShape {

if (isSquare == YES) { 
    square.alpha = 0.0;
    cirle.alpha = 1.0;
    isSquare = NO;
 }

if (isSquare == NO) {
    circle.alpha = 0.0;
    square.alpha = 1.0;
    isSquare = YES;
}


}

//rls memory as necessary.
@end

//////////////////////////////在你看来的控制班里。

实例化您的类并将其添加为子视图。

@class Shape;

@interface ShapeViewController : UIViewController {
    Shape *shape;
}

@property (nonatomic, retain) Shape *shape;


-(IBAction)clickedButton:(id)sender;

@end

////////

#import "Shape.h"
@implementation ShapeViewController;

 //add your shape as a subview in viewDidLoad:

-(IBAction)clickedButton:(id)sender {
  [shape changeShape];
}
@end

那应该给你一个很好的基本实现想法。基本上，您设计一个类，然后每次单击更改其形状。它应该从正方形/圆形/方形/圆形交替。希望有所帮助。

初学iPhone控制器问题

1 个答案: