简单用UIView实现UIImageView

.h

#import <UIKit/UIKit.h>

@interface ZHCustomImageView : UIView

//提供接口

@property (nonatomic, strong) UIImage* image;

- (instancetype)initWithImage:(UIImage*)image;

@end

.m

#import "ZHCustomImageView.h"

@implementation ZHCustomImageView

- (instancetype)initWithImage:(UIImage *)image {

    if (self = [super initWithFrame:CGRectMake(0, 0, image.size.width, image.size.height)]) {

        self.image = image;

    }

    return self;

}

- (void)setImage:(UIImage *)image {

    _image = image;

    

    [self setNeedsDisplay];

}

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    // Drawing code

    

    [self.image drawInRect:rect];

}

@end

调用方法与UIImageView相似.