键盘透明: textField.keyboardAppearance = UIKeyboardAppearanceAlert;
状态栏的网络活动风火轮是否旋转: [UIApplication sharedApplication].networkActivityIndicatorVisible , 默认值是 NO 。
.截取屏幕图片: // 创建一个基于位 图的图形上下文并指定大小为CGSizeMake(200,400)
UIGraphicsBeginImageContext(CGSizeMake(,)); //renderInContext 呈现接受者及其子范围到 指定的上下文
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
// 返回 一个基于当前图形上下文的图片
UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext();
// 移除栈顶 的基于当前位图的图形上下文
UIGraphicsEndImageContext();
// 以 png 格式 返回指定图片的数据
imageData = UIImagePNGR epresentation(aImage);
更改cell选中的背景: UIView *myview = [[UIView alloc] init];
myview.frame = CGRectMake(, , , );
myview.backgroundColor = [UIColorcolorWithPatternImage:[UIImage imageNamed:@"0006.png"]];
cell.selectedBackgroundView = myview;
.显示图片: CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f);
UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];
[myImage setImage:[UIImage imageNamed:@"myImage.png"]];
myImage.opaque = YES; //opaque 是否透明
[self.view addSubview:myImage];
能让图片适应框的大小(beta) NSString*imagePath = [[NSBundle mainBundle] pathForResource:@"XcodeCrash"ofType:@"png"];
UIImage *image = [[UIImage alloc]initWithContentsOfFile:imagePath];
UIImage *newImage= [image transformWidth:.f height:.f];
UIImageView *imageView = [[UIImageView alloc]initWithImage: newImage];
[newImagerelease];
[image release];
[self.view addSubview:imageView];
实现点击图片进行跳转的代码:(生成一个带有背景图片的button,给button绑定想要的事件) UIButton *imgButton=[[UIButton alloc]initWithFrame:CGRectMake(, , , )];
[imgButton setBackgroundImage:(UIImage *)[self.imgArray objectAtIndex:indexPath.row] forState:UIControlStateNormal];
imgButton.tag=[indexPath row];
[imgButton addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
.第二种方法:在背景图片上添加Tap事件,相应单击处理。这种方法,很好代替了button方式,但是如果UI上没有背景图片,这种方法又回到到第一种山寨的方法行列中。 // 添加带有处理时间的背景图片 UIImageView *backView = [[UIImageView alloc] initWithFrame:CGRectMake(, , self.view.bounds.size.width, self.view.bounds.size.height)]; backView.image = [UIImage imageNamed:@"small3.png"]; backView.userInteractionEnabled = YES; UITapGestureRecognizer *singleTouch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard:)]; [backView addGestureRecognizer:singleTouch]; backView.tag = ; [self.view addSubview:backView]; -(void)dismissKeyboard:(id)sender{ [text resignFirstResponder]; }