- 方式一
UIImage *image = [UIImage imageNamed:@"chat_send_nor"];
// 作用: 根据传入需要保护的区域返回一张受保护的图片
UIEdgeInsets edgeInsets = UIEdgeInsetsMake(image.size.height * 0.5, image.size.width * 0.5, image.size.height * 0.5 -1, image.size.width * 0.5 -1);
UIImage *protectImage = [image resizableImageWithCapInsets:edgeInsets];
self.imageView.image = protectImage;
- 方式二
UIImage *image = [UIImage imageNamed:@"chat_send_nor"];
UIEdgeInsets edgeInsets = UIEdgeInsetsMake(image.size.height * 0.5, image.size.width * 0.5, image.size.height * 0.5 -1, image.size.width * 0.5 -1);
/*
UIImageResizingModeTile, 以平铺的方式进行拉伸
UIImageResizingModeStretch, 直接拉伸平铺
*/
UIImage *protectImage = [image resizableImageWithCapInsets:edgeInsets resizingMode:UIImageResizingModeTile];
self.imageView.image = protectImage;
- 方式三
UIImage *image = [UIImage imageNamed:@"chat_send_nor"];
// rightCapWidth = width - leftCapWidth - 1
// bottomCapWidth = height - topCapWidth - 1
UIImage *protectImage = [image stretchableImageWithLeftCapWidth:image.size.width * 0.5 topCapHeight:image.size.height *0.5];
self.imageView.image = protectImage;
- 方式四
// 为UIImage添加一个分类
// UIImage+XMGExtention.h
#import <UIKit/UIKit.h>
@interface UIImage (XMGExtention)
/**
* 返回一张受保护的图片
*
* @param imageName 图片的名称
*
* @return 受保护的图片
*/
+ (instancetype)resizableImageWithImageName:(NSString *)imageName;
@end
// UIImage+XMGExtention.m
#import "UIImage+XMGExtention.h"
@implementation UIImage (XMGExtention)
+(instancetype)resizableImageWithImageName:(NSString *)imageName{
// 创建图片对象
UIImage *image = [UIImage imageNamed:imageName];
// 图片的尺寸
CGFloat imageWidth = image.size.width * 0.5;
CGFloat imageHeight = image.size.height * 0.5;
return [image stretchableImageWithLeftCapWidth:imageWidth topCapHeight:imageHeight];
}
@end
UIImage *image = [UIImage resizableImageWithImageName:@"chat_send_nor"];
self.imageView.image = image;
-
方式五
