IOS7笔记- 7、视图、绘制、手势识别

１、字体设置

#define CORNER_FON_STANDARD_HEIGHT 180.0
-(CGFloat)cornerScaleFator { return self.bounds.size.height / CORNER_FON_STANDARD_HEIGHT;}
UIFont *cornerFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
cornerFont = [cornerFont fontWithSize:cornerFont.pointSize * [self cornerScaleFator]];

２、段落设置

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.alignment = NSTextAlignmentCenter;

３、绘图

 1 - (void)drawRect:(CGRect)rect
 2  {
 3      // Drawing code
 4      UIBezierPath *roundedRect = [UIBezierPath bezierPathWithRoundedRect:self.bounds
 5                                                              cornerRadius:[self cornerRadius]];
 6      [roundedRect addClip];
 7      
 8      [[UIColor whiteColor] setFill];
 9      UIRectFill(self.bounds);
10      
11      [[UIColor blackColor] setStroke];
12      [roundedRect stroke];
13      
14      if(self.faceUp){
15          UIImage *faceImage = [UIImage imageNamed:[NSString stringWithFormat:@"%@%@", [self rankAsString], self.suit]];
16          if (faceImage) {
17              CGRect imageRect = CGRectInset(self.bounds,
18                                             self.bounds.size.width * (1.0 - self.faceCardScaleFactor),
19                                             self.bounds.size.height * (1.0 - self.faceCardScaleFactor));
20              [faceImage drawInRect:imageRect];
21          } else {
22              [self drawPips];
23          }
24          
25          [self drawCorners];
26      } else {
27          [[UIImage imageNamed:@"cardback"] drawInRect:self.bounds];
28      }
29      
30  }
 1 -(void)drawCorners
 2 {
 3     NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
 4     paragraphStyle.alignment = NSTextAlignmentCenter;
 5     
 6     UIFont *cornerFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
 7     cornerFont = [cornerFont fontWithSize:cornerFont.pointSize * [self cornerScaleFator]];
 8     
 9     NSAttributedString *cornerText = [[NSAttributedString alloc]
10                                       initWithString:[NSString stringWithFormat:@"%@\n%@", [self rankAsString], self.suit]
11                                       attributes:@{NSFontAttributeName : cornerFont, NSParagraphStyleAttributeName :paragraphStyle}];
12     CGRect textBounds;
13     textBounds.origin = CGPointMake([self cornerOffset], [self cornerOffset]);
14     textBounds.size = [cornerText size];
15     [cornerText drawInRect:textBounds];
16     
17     CGContextRef context = UIGraphicsGetCurrentContext();
18     CGContextTranslateCTM(context, self.bounds.size.width, self.bounds.size.height);
19     CGContextRotateCTM(context, M_PI);
20     [cornerText drawInRect:textBounds];
21 }

５、添加手势有两种方法：一种是对指定view中拖入手势控件，再由控件Ctrl成相应的Action实现。另一种是先在view相关的Controller中实现公共手势方法，在主View中添加手势事件,如下：

 1 //子View中实现公共手势方法（缩放手势）
 2 -(void)pinch:(UIPinchGestureRecognizer *)gesture
 3 {
 4     if((gesture.state == UIGestureRecognizerStateChanged ||
 5         gesture.state == UIGestureRecognizerStateEnded)) {
 6         self.faceCardScaleFactor *= gesture.scale;
 7         gesture.scale = 1.0;
 8     }
 9 }
10 //主View中添加手势事件
11 - (void)viewDidLoad
12 {
13     [super viewDidLoad];
14     // Do any additional setup after loading the view, typically from a nib.
15     [self.playingCardView addGestureRecognizer:[[UIPinchGestureRecognizer alloc] initWithTarget:self.playingCardView action:@selector(pinch:)]];
16 }

 

posted @ 2016-06-07 16:54  Faint@LastStep  阅读(256)  评论(0)  编辑  收藏  举报