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IOS學(xué)習(xí)筆記(十)之UIImageView圖片視圖的基本概念和使用方法

發(fā)布時間:2020-07-04 17:44:02 來源:網(wǎng)絡(luò) 閱讀:638 作者:jiangqq900826 欄目:移動開發(fā)

 IOS學(xué)習(xí)筆記(十)之UIImageView圖片視圖的基本概念和使用方法

     Author:hmjiangqq

     Email:jiangqqlmj@163.com

UIImageView:

作用:專門用于顯示圖片

首先看下官方的解說:

 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.

常用屬性和方法:
IOS學(xué)習(xí)筆記(十)之UIImageView圖片視圖的基本概念和使用方法

實例代碼:

//創(chuàng)建圖片視圖
//創(chuàng)建圖片視圖
UIImageView *p_w_picpathview=[[UIImageView  alloc]initWithFrame:CGRectMake(140, 100, 45, 45)];
//設(shè)置高亮
p_w_picpathview.highlighted=YES;
//設(shè)置圖片
p_w_picpathview.p_w_picpath=[UIImage p_w_picpathNamed:@"notification_icon"];
//設(shè)置高亮圖片
p_w_picpathview.highlightedImage=[UIImage p_w_picpathNamed:@"notification_icon"];
[self.window addSubview:p_w_picpathview];

- (id)initWithImage:(UIImage *)p_w_picpath;    //初始化一張圖片
- (id)initWithImage:(UIImage *)p_w_picpath highlightedImage:(UIImage *)highlightedImage NS_AVAILABLE_IOS(3_0);
//初始化 加入一張高亮圖片與本身圖片
//默認圖片
@property(nonatomic,retain) UIImage *p_w_picpath;                                                     // default is nil
//高亮圖片
@property(nonatomic,retain) UIImage *highlightedImage NS_AVAILABLE_IOS(3_0);      // default is nil
@property(nonatomic,getter=isUserInteractionEnabled) BOOL userInteractionEnabled;               // default is NO
//設(shè)置為YES 用戶才可以進行點擊
//設(shè)置為YES 圖片高亮顯示
@property(nonatomic,getter=isHighlighted) BOOL highlighted NS_AVAILABLE_IOS(3_0); // default is NO


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