效果
源码：https://github.com/youxianming/animations
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//
// gridflowlayoutviewcontroller.m
// animations
//
// created by youxianming on 16/5/5.
// copyright © 2016年 youxianming. all rights reserved.
//
#import "gridflowlayoutviewcontroller.h"
#import "uiview+setrect.h"
#import "gridlayout.h"
#import "flowstylecell.h"
#import "filemanager.h"
#import "nsstring+md5.h"
#import "nsdata+jsondata.h"
#import "responsedata.h"
#import "math.h"
#import "gcd.h"
static nsstring *picturessource = @"http://www.duitang.com/album/1733789/masn/p/0/50/";
@interface gridflowlayoutviewcontroller () <uicollectionviewdatasource, uicollectionviewdelegate, gridlayoutdelegate>
@property (nonatomic, strong) uicollectionview *collectionview;
@property (nonatomic) cgfloat rowheight;
@property (nonatomic, strong) nsmutablearray *datas;
@property (nonatomic, strong) responsedata *picturesdata;
@property (nonatomic, strong) nsmutablearray <waterfallpicturemodel *> *datasource;
@end
@implementation gridflowlayoutviewcontroller
- (void)setup {
[super setup];
_datasource = [nsmutablearray new];
// 初始化布局文件
cgfloat gap = 1;
nsinteger rowcount = arc4random() % 3 + 2;
_rowheight = (self.contentview.height - (rowcount + 1) * gap) / (cgfloat)rowcount;
gridlayout *layout = [gridlayout new];
layout.manager.edgeinsets = uiedgeinsetsmake(gap, gap, gap, gap);
layout.manager.gap = gap;
layout.delegate = self;
nsmutablearray *rowheights = [nsmutablearray array];
for (int i = 0; i < rowcount; i++) {
[rowheights addobject:@(_rowheight)];
}
layout.manager.rowheights = rowheights;
self.collectionview = [[uicollectionview alloc] initwithframe:self.contentview.bounds
collectionviewlayout:layout];
self.collectionview.delegate = self;
self.collectionview.datasource = self;
self.collectionview.backgroundcolor = [uicolor clearcolor];
self.collectionview.showshorizontalscrollindicator = no;
self.collectionview.alpha = 0;
[self.collectionview registerclass:[flowstylecell class] forcellwithreuseidentifier:@"flowstylecell"];
[self.contentview addsubview:self.collectionview];
// 获取数据
[gcdqueue executeinglobalqueue:^{
nsstring *string = [picturessource lowermd532bitstring];
nsstring *realfilepath = [filemanager therealfilepath:[nsstring stringwithformat:@"~/documents/%@", string]];
nsdata *data = nil;
if ([filemanager fileexistwithrealfilepath:realfilepath] == no) {
data = [[nsdata alloc] initwithcontentsofurl:[nsurl urlwithstring:picturessource]];
[data writetofile:realfilepath atomically:yes];
} else {
data = [nsdata datawithcontentsoffile:realfilepath];
}
nsdictionary *datadic = [data tolistproperty];
[gcdqueue executeinmainqueue:^{
self.picturesdata = [[responsedata alloc] initwithdictionary:datadic];
if (self.picturesdata.success.integervalue == 1) {
for (int i = 0; i < self.picturesdata.data.blogs.count; i++) {
[_datasource addobject:self.picturesdata.data.blogs[i]];
}
[_collectionview reloaddata];
[uiview animatewithduration:0.5f animations:^{
_collectionview.alpha = 1.f;
}];
}
}];
}];
}
- (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section {
return self.datasource.count;
}
- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {
waterfallpicturemodel *picturemodel = _datasource[indexpath.row];
flowstylecell *cell = [collectionview dequeuereusablecellwithreuseidentifier:@"flowstylecell" forindexpath:indexpath];
cell.indexpath = indexpath;
cell.data = picturemodel;
cell.rowheight = _rowheight;
[cell loadcontent];
return cell;
}
- (cgfloat)itemwidthwithindexpath:(nsindexpath *)indexpath {
waterfallpicturemodel *picturemodel = _datasource[indexpath.row];
return [math resetfromsize:cgsizemake(picturemodel.iwd.floatvalue, picturemodel.iht.floatvalue)
withfixedheight:_rowheight].width;
}
@end
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细节
继承uicollectionviewlayout
重载uicollectionviewlayout的四个方法
部分实现细节
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