我正在使用CGRect创建一个图像框架.我想将创建的矩形居中.
我已经在这里以及Apple文档中找到了最佳方法,并找到了获得中心坐标的CGRectGetMidY和CGRectGetMidX.
当我尝试将此实现到我自己的代码中时,我遇到了问题.我在UIIMageView类型的对象上找不到属性大小错误
#import "MyViewController.h"
@interface MyViewController ()
@end
@implementation MyViewController
@synthesize mySignatureImage;
@synthesize lastContactPoint1,lastContactPoint2,currentPoint;
@synthesize imageFrame;
@synthesize fingerMoved;
@synthesize navbarHeight;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor lightGrayColor];
CGRect mySignatureImageFrame = CGRectMake(
CGRectGetMidX(self.view.frame) - (mySignatureImage.size.width/ 2.0),CGRectGetMidY(self.view.frame) - (mySignatureImage.size.height / 2.0),image.size.width,image.size.height);
#import <UIKit/UIKit.h>
@interface MyViewController : UIViewController <UIAlertViewDelegate>
@property (nonatomic,strong) UIImageView *mySignatureImage;
@property (nonatomic,assign) CGPoint lastContactPoint1,currentPoint;
@property (nonatomic,assign) CGRect imageFrame;
@property (nonatomic,assign) BOOL fingerMoved;
@property (nonatomic,assign) float navbarHeight;
@property (strong,nonatomic) NSManagedObjectContext *managedObjectContext;
解决方法
假设图像是UIImage类型,那么：
CGRect imageFrame = CGRectMake(
CGRectGetMidX(self.view.frame) - (image.size.width / 2.0),CGRectGetMidY(self.view.frame) - (image.size.height / 2.0),image.size.height);
假设imageView的类型为UIImageView,则：
CGRect imageFrame = CGRectMake(
CGRectGetMidX(self.view.frame) - CGRectGetMidX(imageView.frame),CGRectGetMidY(self.view.frame) - CGRectGetMidY(imageView.frame),CGRectGetWidth(imageView.frame),CGRectGetHeight(imageView.frame));
