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前言
相信对于ios开发者们来说，在开发过程中，经常用uitableview，一定会遇到数据为空的情况，这时需要在空页面上放一个图片和一行文字提示数据为空，下面整理了两种方法来实现这个功能。
第一个是继承uitableview，在新类中集成图片和文字
#import <uikit/uikit.h> #import "const.h" @interface wfemptytableview : uitableview @property (nonatomic, assign) bool showemptytipview; // 是否显示背景提示文字 @property (nonatomic, assign) nsinteger voffset; @property (nonatomic, copy) nsstring *tipstring; // 提示文字 @property (nonatomic, copy) nsstring *tipimagename; // 提示图片 @end
具体实现
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#import "wfemptytableview.h"
@implementation wfemptytableview {
uiview *_custombackview;
uiimageview *_tipimageview;
uilabel *_label;
cgrect _imageframe;
cgrect _labelframe;
double _scale;
}
- (wfemptytableview *)initwithframe:(cgrect)frame style:(uitableviewstyle)style {
self = [super initwithframe:frame style:style];
if (self) {
[self setupviews];
}
return self;
}
- (void)setupviews {
_custombackview = [[uiview alloc] initwithframe:self.frame];
_custombackview.backgroundcolor = [uicolor yellowcolor];
_tipimageview = [[uiimageview alloc] initwithframe:cgrectmake((kscreenwidth-200/2)/2, self.frame.size.height/3, 200/2, 200/2)];
[_custombackview addsubview:_tipimageview];
_imageframe = _tipimageview.frame;
_label = [[uilabel alloc] initwithframe:cgrectmake(0, cgrectgetmaxy(_tipimageview.frame), kscreenwidth, 100)];
_label.backgroundcolor = [uicolor clearcolor];
_label.textalignment = nstextalignmentcenter;
_label.textcolor = [uicolor lightgraycolor];
_label.font = [uifont systemfontofsize:16];
_label.linebreakmode = nslinebreakbycharwrapping;
_label.numberoflines = 0;
[_custombackview addsubview:_label];
_labelframe = _label.frame;
}
- (void)setshowemptytipview:(bool)showemptytipview {
_showemptytipview = showemptytipview;
if (showemptytipview) {
[self addsubview:_custombackview];
} else {
[_custombackview removefromsuperview];
}
}
- (void)settipstring:(nsstring *)tipstring {
_tipstring = tipstring;
nsmutableattributedstring * attributedstring1 = [[nsmutableattributedstring alloc] initwithstring:tipstring];
nsmutableparagraphstyle * paragraphstyle1 = [[nsmutableparagraphstyle alloc] init];
[paragraphstyle1 setlinespacing:15];
[paragraphstyle1 setalignment:nstextalignmentcenter];
[attributedstring1 addattribute:nsparagraphstyleattributename value:paragraphstyle1 range:nsmakerange(0, [tipstring length])];
[_label setattributedtext:attributedstring1];
[self resetframe];
}
- (void)settipimagename:(nsstring *)tipimagename {
_scale = 1;
uiimage *image = [uiimage imagenamed:tipimagename];
_scale = image.size.height*1.0 / image.size.width;
_tipimageview.image = image;
if (isnan(_scale)) {
_scale = 1;
}
[self resetframe];
}
- (void)setvoffset:(nsinteger)voffset {
_label.frame = cgrectmake(cgrectgetminx(_label.frame), cgrectgetminy(_label.frame)+voffset, cgrectgetwidth(_label.frame), cgrectgetheight(_label.frame));
_tipimageview.frame = cgrectmake(cgrectgetminx(_tipimageview.frame), cgrectgetminy(_tipimageview.frame)+voffset, cgrectgetwidth(_tipimageview.frame), cgrectgetheight(_tipimageview.frame));
}
- (void)resetframe {
_tipimageview.frame = cgrectmake(0, cgrectgetminy(_tipimageview.frame), 150, 150 * _scale);
_tipimageview.center = cgpointmake(kscreenwidth / 2.0, _tipimageview.center.y);
_label.frame = cgrectmake(cgrectgetminx(_label.frame), cgrectgetmaxy(_tipimageview.frame), cgrectgetwidth(_label.frame), cgrectgetheight(_label.frame));
}
@end
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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