主要講解利用uilabel的來做乙個簡單的toast效果。這個是看到wdlabel的實現，感覺挺好的，就
主要的思路就是繼承uilabel，然後在drawrect:(cgrect)rect裡面進行調整，以達到乙個toast的效果。
#define klabelcornerradius 9.0f
- (void)drawrect:(cgrect)rect
- (void) showmessage:(nsstring *)message
- (void) showmessage:(nsstring *)message autohide:(bool)autohide position:(cgpoint)position duration:(float)duration
if ([message length] > 20 ) else
messagelabel_.text = message;
[messagelabel_ sizetofit]; //適應一下大小
cgrect frame = messagelabel_.frame;
frame.size
.width = max(frame.size
.width, kminimummessagewidth);
frame = cgrectinset(frame, -20, -15);
messagelabel_.frame = frame;
messagelabel_.sharpcenter = position;
if (created) ];
}// start message dismissal timer
if (messagetimer_)
if (autohide)
}- (void) nixmessagelabel
if (messagelabel_)
}- (void)hidemessage:(nstimer *)timer
completion:^(bool finished) ];
}
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