还有一种方法，是用Category
#import <UIKit/UIKit.h>
@interface UITableView (WFEmpty)
@property (nonatomic, strong, readonly) UIView *emptyView;
-(void)addEmptyViewWithImageName:(NSString*)imageName title:(NSString*)title;
@end
具体实现
#import "UITableView+WFEmpty.h"
#import <objc/runtime.h>
static char UITableViewEmptyView;
@implementation UITableView (WFEmpty)
@dynamic emptyView;
- (UIView *)emptyView
{
return objc_getAssociatedObject(self, &UITableViewEmptyView);
}
- (void)setEmptyView:(UIView *)emptyView
{
[self willChangeValueForKey:@"HJEmptyView"];
objc_setAssociatedObject(self, &UITableViewEmptyView,
emptyView,
OBJC_ASSOCIATION_ASSIGN);
[self didChangeValueForKey:@"HJEmptyView"];
}
-(void)addEmptyViewWithImageName:(NSString*)imageName title:(NSString*)title
{
if (!self.emptyView)
{
CGRect frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
UIImage* image = [UIImage imageNamed:imageName];
NSString* text = title;
UIView* noMessageView = [[UIView alloc] initWithFrame:frame];
noMessageView.backgroundColor = [UIColor clearColor];
UIImageView *carImageView = [[UIImageView alloc] initWithFrame:CGRectMake((frame.size.width-image.size.width)/2, 60, image.size.width, image.size.height)];
[carImageView setImage:image];
[noMessageView addSubview:carImageView];
UILabel *noInfoLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 160, frame.size.width, 20)];
noInfoLabel.textAlignment = NSTextAlignmentCenter;
noInfoLabel.textColor = [UIColor lightGrayColor];
noInfoLabel.text = text;
noInfoLabel.backgroundColor = [UIColor clearColor];
noInfoLabel.font = [UIFont systemFontOfSize:20];
[noMessageView addSubview:noInfoLabel];
[self addSubview:noMessageView];
self.emptyView = noMessageView;
}
}
@end
总结
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