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ios按鈕圓角處理

UIButton *btn = [[UIButton alloc]initWithFrame:btnFrame];

// 設定圓角半徑
btn.layer.masksToBounds = YES;
btn.layer.cornerRadius = 4;

//設定邊框寬度和顏色
btn.layer.borderWidth = 1;
btn.layer.borderColor = [UIColor darkGrayColor].CGColor;