#import "mayviewcontroller.h"
#import "touch.h"
@inte***ce mayviewcontroller ()
@end
@implementation mayviewcontroller
- (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil
return self;
}- (void)viewdidload
新建乙個檢視類touch,加入在檢視控制器上,在touch.m檔案裡實現縮放功能
#import "touch.h"
@implementation touch
- (id)initwithframe:(cgrect)frame
return self;
}//計算兩點之間的距離
- (cgfloat)distance:(cgpoint)point1 point2:(cgpoint)point2
- (void)touchesmoved:(nsset *)touches withevent:(uievent *)event
//設定觸控點
nsarray *array = [touches allobjects];
uitouch *touch1 = [array firstobject];
uitouch *touch2 = [array lastobject];
//獲取移動前的觸控點
cgpoint firstpreviouspoint = [touch1 previouslocationinview:self];
cgpoint secondpreviouspoint = [touch2 previouslocationinview:self];
//獲取與移動後的觸控點
cgpoint firstcurrentpoint = [touch1 locationinview:self];
cgpoint secondcurrentpoint = [touch2 locationinview:self];
//獲取移動前後的兩點之間的距離
cgfloat previousdistance = [self distance:firstpreviouspoint point2:secondpreviouspoint];
cgfloat currentdistance = [self distance:firstcurrentpoint point2:secondcurrentpoint];
//獲取縮放比例
cgfloat scanl = currentdistance / previousdistance;
//獲得縮放後的檢視大小
self.bounds = cgrectmake(0, 0, self.bounds.size.width * scanl, self.bounds.size.height * scanl);}
是否吞噬觸控點需要控制兩個地方
是否吞噬觸控點需要控制兩個地方 1 ccdirector shareddirector gettouchdispatcher addtargeteddelegate this,kccmenuhandlerpriority 99,true 當上面語句中的第三個引數為false時,該層不會吞噬觸控點,並...
WKWebView的兩個坑點
蘋果在 wkwebview 中的 js runtime 裡事先注入了乙個 window.webkit.messagehandlers.giveuid.postmessage 方法,我們可以使用這個方法直接向 native 層傳值,異常方便。首先,我們要把乙個名為 giveuid 的 scriptme...
c struct的兩個注意點
1.c 的結構體變數在宣告的時候可以省略struct,在c中這樣是不可以的,例子如下 1 include2 include 3using namespace std 45 struct test 910 int main void 11 2.c 的結構體宣告可以宣告在main 函式中,也可以在mai...