IOS学习笔记(十)之UIImageView图片视图的基本概念和使用方法

Author:hmjiangqq

Email:jiangqqlmj@163.com

UIImageView:

作用:专门用于显示图片

首先看下官方的解说:

An p_w_picpath view object provides a view-based container for displaying either a single p_w_picpath or for animating a series of p_w_picpaths. For animating the p_w_picpaths, the UIImageView class provides controls to set the duration and frequency of the animation. You can also start and stop the animation freely.

When a UIImageView object displays one of its p_w_picpaths, the actual behavior is based on the properties of the p_w_picpath and the view. If either of the p_w_picpath’s leftCapWidth ortopCapHeight properties are non-zero, then the p_w_picpath is stretched according to the values in those properties. Otherwise, the p_w_picpath is scaled, sized to fit, or positioned in the p_w_picpath view according to the contentMode property of the view. It is recommended (but not required) that you use p_w_picpaths that are all the same size. If the p_w_picpaths are different sizes, each will be adjusted to fit separately based on that mode.

All p_w_picpaths associated with a UIImageView object should use the same scale. If your application uses p_w_picpaths with different scales, they may render incorrectly.

常用属性和方法：

实例代码:

//创建图片视图//创建图片视图UIImageView *p_w_picpathview=[[UIImageView alloc]initWithFrame:CGRectMake(140, 100, 45, 45)];//设置高亮p_w_picpathview.highlighted=YES;//设置图片p_w_picpathview.p_w_picpath=[UIImage p_w_picpathNamed:@"notification_icon"];//设置高亮图片p_w_picpathview.highlightedImage=[UIImage p_w_picpathNamed:@"notification_icon"];[self.window addSubview:p_w_picpathview];

- (id)initWithImage:(UIImage *)p_w_picpath; //初始化一张图片- (id)initWithImage:(UIImage *)p_w_picpath highlightedImage:(UIImage *)highlightedImage NS_AVAILABLE_IOS(3_0);//初始化 加入一张高亮图片与本身图片//默认图片@property(nonatomic,retain) UIImage *p_w_picpath; // default is nil//高亮图片@property(nonatomic,retain) UIImage *highlightedImage NS_AVAILABLE_IOS(3_0); // default is nil@property(nonatomic,getter=isUserInteractionEnabled) BOOL userInteractionEnabled; // default is NO//设置为YES 用户才可以进行点击//设置为YES 图片高亮显示@property(nonatomic,getter=isHighlighted) BOOL highlighted NS_AVAILABLE_IOS(3_0); // default is NO