我将图像加载到 UIImageView 中,其中覆盖了 UIView(其中绘制了 CGRect),我正在寻找一种将屏幕上显示的内容保存为新图像的方法。我正在使用故事板和 ARC。
我有一个 UIViewController,它包含 UIImageView。UIView 显示在此之上,并在用户触摸屏幕的位置绘制一个圆圈。这一切都很好,但现在我想将显示的内容保存为图像(JPG)。
我的故事板截图:
下面是到目前为止我的 PhotoEditViewController 的代码。passPhoto 是加载到 UIImageView 中的照片。
#import "PhotoEditViewController.h"
@interface PhotoEditViewController ()
@end
@implementation PhotoEditViewController
@synthesize selectedPhoto = _selectedPhoto;
@synthesize backButton;
@synthesize savePhoto;
- (void)viewDidLoad {
[super viewDidLoad];
[passedPhoto setImage:_selectedPhoto];
}
- (void)viewDidUnload {
[self setBackButton:nil];
[self setSavePhoto:nil];
[super viewDidUnload];
}
- (IBAction)savePhoto:(id)sender{
NSLog(@"save photo");
// this is where it needs to happen!
}
@end
下面是来自我的 PhotoEditView 的代码,它处理圆圈覆盖的创建:
#import "PhotoEditView.h"
@implementation PhotoEditView
@synthesize myPoint = _myPoint;
- (void)setMyPoint:(CGPoint)myPoint {
_myPoint = myPoint;
self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.01];
[self setNeedsDisplay];
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
return self;
}
-(void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event {
NSSet *allTouches = [event allTouches];
switch ([allTouches count]){
case 1: {
UITouch *touch = [[allTouches allObjects] objectAtIndex:0];
CGPoint point = [touch locationInView:self];
NSLog(@"x=%f", point.x);
NSLog(@"y=%f", point.y);
self.myPoint = point;
}
break;
}
}
- (void)drawRect:(CGRect)rect {
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(ctx, 4.0);
CGContextSetRGBFillColor(ctx, 0, 0, 0, 0.5);
CGContextSetRGBStrokeColor(ctx, 1.0, 0.0, 0.0, 1);
CGContextStrokePath(ctx);
CGRect circlePoint = CGRectMake(self.myPoint.x - 50, self.myPoint.y - 50, 100.0, 100.0);
CGContextStrokeEllipseInRect(ctx, circlePoint);
}
@end
任何帮助,将不胜感激。