不規則瀑布流

封裝的layout

#import #import @protocol waterlayoutdelegate @required

- (cgsize)collectionview:(uicollectionview *)collectionview
layout:(uicollectionviewlayout *)collectionviewlayout
sizeforitematindexpath:(nsindexpath *)indexpath;
@end
@inte***ce wjy_wate***lllayout : uicollectionviewlayout
@property (nonatomic, assign) iddelegate;
// 行數
@property (nonatomic, assign) nsinteger linecount;
// 水平間距
@property (nonatomic, assign) cgfloat verticalspacing;
// 垂直間距
@property (nonatomic, assign) cgfloat horizontalspacing;
@property (nonatomic, assign) uiedgeinsets sectioninset;
@end

#import "wjy_wate***lllayout.h"

@inte***ce wjy_wate***lllayout()
@property (nonatomic, retain) nsmutablearray *heights;
@property (nonatomic, retain) nsmutablearray *originx;
@property (nonatomic, retain) nsmutabledictionary *itemsarrange;
@property (nonatomic, retain) nsmutabledictionary *itemsinitialarrange;
@end
@implementation wjy_wate***lllayout
#pragma mark - 重寫，應 始終呼叫子類
- (void)preparelayout
// 調轉系統的協議方法 並設定**
self.delegate = (id)self.collectionview.delegate;
self.itemsarrange = [nsmutabledictionary dictionary];
self.itemsinitialarrange = [nsmutabledictionary dictionary];
[self initallarrays];
for (nsinteger i = 0; i < cellcount; i++) 
}#pragma 初始化所以陣列
- (void)initallarrays
else 
// 把得到的點加到 x陣列中
[self.originx addobject:[nsnumber numberwithdouble: oringin_x]];
}}#pragma mark - itme設定
- (void)layoutforitematindexpath:(nsindexpath *)indexpath
#pragma mark - 子類必須重寫此方法並使用它來返回的寬度和高度的檢視的內容。這些值表示的寬度和高度的所有內容，檢視使用此資訊來配置其自身內容的大小，以便滾動。
- (cgsize)collectionviewcontentsize
#pragma mark - 設定布局資訊
- (uicollectionviewlayoutattributes *)layoutattributesforitematindexpath:(nsindexpath *)indexpath 
cgrect rect = cgrectfromstring(rectstr);
attributes.frame = rect;
break;
}return attributes;
}#pragma mark - 重新自定義layout
// layout初始化方法
uicollectionviewlayoutattributes *attributes = [uicollectionviewlayoutattributes layoutattributesforcellwithindexpath:itemindexpath];
nsarray *keyarr = self.itemsarrange.allkeys;
for (nsstring *rectstr in keyarr) 
cgrect rect = cgrectfromstring(rectstr);
attributes.frame = rect;
break;
}return attributes;
}#pragma mark - 布局屬性返回陣列 檢視在給定矩形
- (nsarray *)layoutattributesforelementsinrect:(cgrect)rect 
}return attributes;
}# pragma mark - 獲取低行高
- (nsinteger)getlowerheightrowindex:(nsmutablearray *)height 
nsinteger index = 0;
cgfloat heightest = [height[0] doublevalue];
for (nsinteger i = 1; i < height.count; i++) 
return index;
}# pragma mark - 獲取高度
- (cgfloat)getheightest:(nsmutablearray *)height 
cgfloat heightest = self.sectioninset.top;
// 遍歷最高點
for (nsinteger i = 0; i < height.count; i++) 
return heightest;
}@end

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