iOS小知識點

獲取快取

1.匯入

#import "sdimagecache.h"

//把b單位轉換為m

[nsstring stringwithformat:@"%.2fm",(double)[[sdimagecache sharedimagecache] getsize]/1000/1000];

清除快取

[[sdimagecache sharedimagecache] cleardisk];

獲取某資料夾中所有檔案快取

//資料夾列舉器，可以列舉這個資料夾內以及這個資料夾的子資料夾中的所有檔案

nsdirectoryenumerator *enumerator = [[nsfilemanager defaultmanager] enumeratoratpath:<[commontool filedownloadpath]>>>需要遍歷的資料夾路經];

unsigned long long totalsize = 0;

while ([enumerator nextobject])

totalsize+=[[enumerator fileattributes] filesize];

[nsstring stringwithformat:@"%.2fm",(double)totalsize/1000/1000];

清理檔案快取

[[nsfilemanager defaultmanager] removeitematpath:<[commontool filedownloadpath]>>>需要刪除的資料夾路經 error:nil];

//push時自動隱藏tabbar

vc.hidesbottombarwhenpushed = yes;

自適應高度

cgrect rect = [_news.intr-需要獲取的字串- boundingrectwithsize:cgsizemake(screen_width-30>-需要多寬折行, 0) options:nsstringdrawinguseslinefragmentorigin|nsstringdrawingusesfontleading attributes:@ context:nil];

return rect.size.height+30;

獲取鍵盤的高度輸入框自適應

_inputview 是自定義的乙個 view 加上 textfield 的輸入框

[[nsnotificationcenter defaultcenter]addobserver:self selector:@selector(keyboardwillchangeframe:) name:uikeyboardwillchangeframenotification object:nil];

- (void)keyboardwillchangeframe:(nsnotification *)noti{

// nslog(@"%@",noti.userinfo);

cgrect rect = [[noti.userinfo objectforkey:uikeyboardframeenduserinfokey] cgrectvalue];

[uiview animatewithduration:[[noti.userinfo objectforkey:uikeyboardanimationdurationuserinfokey] floatvalue] animations:^{

_inputview.frame = cgrectmake(0, rect.origin.y-40, screen_width, 40);

_tableview.frame = cgrectmake(0, 0, screen_width, _inputview.frame.origin.y);

---用滑動方式讓鍵盤下去

-(void)scrollviewwillbegindragging:(uiscrollview *)scrollview{

[self.view endediting:yes];

氣泡聊天專用從某個畫素點拉申

self.bubbleimageview.image = [[uiimage imagenamed:@"bubbleself.png"] stretchableimagewithleftcapwidth:25 topcapheight:20];

//設定**為圓形常用語頭像

self.headerimageview.layer.cornerradius = 30—**大小的半徑;

self.headerimageview.layer.maskstobounds = yes;

設定應用圖示的角標

iOS小知識點

iOS小知識點

IOS常見知識點

iOS面試知識點

iOS小知識點

iOS小知識點

IOS常見知識點

iOS面試知識點

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