UIImageView

目录
    1.1 动画效果
    1.2 一像素线切割图片
    1.3 移动
    1.4 星级
    1.5 将图片保存到相册
    1.6 设置图片圆角

1.1 动画效果

NSArray *imageArray = [NSArray arrayWithObjects: [UIImage imageNamed:@"[email protected]"], [UIImage imageNamed:@"[email protected]"], nil];

UIImageView *imageV = [[UIImageView alloc]initWithFrame:CGRectMake(15 , 15, 50, 50)];

imageV.animationImages = imageArray;

//重复次数
imageV.animationRepeatCount = 0;

//
imageV.animationDuration = 0.15*imageArray.count;

[imageV startAnimating];

[self addSubview:imageV];

1.2 一像素线切割图片

leftImage = [leftImage stretchableImageWithLeftCapWidth:30 topCapHeight:35]; 

1.3 移动

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    
    for (UITouch *touch in touches) {
        
        if (touch.view==self.bgview) {
            
            CGPoint point=[touch locationInView:self.view];
            
            self.bgview.center=CGPointMake(self.bgview.frame.size.width/2.0f, point.y-self.bgview.frame.size.height/2.0f);
            
        }
        
    }
}

1.4 星级

![Uploading uiimageView1_404203.png . . .]
.h

#import < UIKit/UIKit.h >

@interface StarView : UIView

- (void)setRating:(CGFloat)rating;

@end



.m

#import "StarView.h"

@interface StarView ()
{
    //背景图
    UIImageView *_backgroundView;
    //前景图
    
    UIImageView *_foreView;
}

@end


@implementation StarView

- (void)createContent
{
    
    self.backgroundColor = [UIColor clearColor];
    
    _backgroundView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 
    65, 23)];
    
    _backgroundView.contentMode=UIViewContentModeLeft;
    
    _backgroundView.image = [UIImage imageNamed:@"StarsBackground"];
    
    
    _foreView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 65, 
    23)];
    
    _foreView.contentMode=UIViewContentModeLeft;
    
    _foreView.image = [UIImage imageNamed:@"StarsForeground"];
    
    _foreView.clipsToBounds = YES;
    
    
    [self addSubview:_backgroundView];
    
    [self addSubview:_foreView];
    
}


- (id)initWithFrame:(CGRect)frame
{
    
    self = [super initWithFrame:frame];
    
    if (self) {
        
        [self createContent];
        
    }
    
    return self;
    
}


- (void)setRating:(CGFloat)rating
{
    
    CGRect frame = _backgroundView.frame;
    
    frame.size.width = frame.size.width*(rating/5.0f);
    
    _foreView.frame = frame;
    
}



使用

StarView *stat = [[StarView alloc]initWithFrame:CGRectMake(100, 200, 
65, 23)];

[self.view addSubview:stat];

[stat setRating:3];

uiimageView1.png

1.5 将图片保存到相册

- (void)buttonClicked:(UIButton *)button{
    
    UIImage *image = [UIImage imageNamed:@"1.png"];
    
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    
}


- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    
    if (error) {
        
        NSLog(@"失败");
        
    } else {
        
        NSLog(@"成功");
        
    }
    
}

1.6 设置图片圆角

/** 这个方法效率很高，比layer快很多 */
- (UIImage *)cutCircleImage {
    
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);
    
    CGContextRef ctr = UIGraphicsGetCurrentContext();
    
    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
    
    CGContextAddEllipseInRect(ctr, rect);
    
    CGContextClip(ctr);
    
    [self drawInRect:rect];
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    return image;
    
}